【单选题】【消耗次数：1】
边长超过( )的洞口，四周设防护栏杆，洞口下张设安全平网。
①
130cm
②
150cm
③
180cm
④
200cm
参考答案：
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相关题目
【单选题】
边长为( )洞口，必须设置四周搭设维护架，并双道防护栏杆，洞口挂安全平网。
①
150~150cm
②
150~130cm
③
140~130cm
④
140~150cm
【多选题】
开挖深度超过2m的基坑周边必须安装防护栏杆。防护栏杆应牢固可靠并符合下列规定（ ）。
①
防护栏杆高度不应低于1.2m
②
横杆应设2道～3道，下杆离地高度宜为0.3m～0.6m ，上杆离地高度宜为1.2m～1.5m
③
立杆间距不宜大于1.8m，立杆离坡边距离宜大于0.5m
④
防护栏杆宜加挂自上而下封闭设置的密目安全网
⑤
挡脚板高度不应小于180mm，挡脚板下沿离地高度不应大于20mm
【单选题】
某块岩石经试验测量，其干质量为300g，总体积为200cm3固体颗粒体积为150 cm3，则其毛体积密度是什么
①
1.0g/cm3
②
1.5g/cm3
③
2.0g/cm3
④
3.0g/cm3
随机题目
【单选题】
阅读理解：阅读下列短文，回答文后问题，选择最佳答案：Goats are being hired to do the work of people near San Diego. The fires that occurred in Hillborbough four years ago destroyed thirty homes, most of which have been rebuilt. While people were rebuilding the homes, the grasses and bushes were growing back. The area is now so overgrown in bushes that there is again a major danger of fire.The city government put up bids to remove the bushes. The lowest bid they received was $50,000—and that was if the city provided breakfast and lunch for the workers for the six weeks it would take to clear the overgrown area. The city only wanted to give unlimited coffee and a piece of bread a day for each person. When that offer was rejected, the city asked for help on its website.A sheepherder in Montanta and a goat-keeper in San Bernardino read about the city’s plight（困境）while surfing the Web. They both offered to do the job for $25,000. The city government chose the goat-keeper because he lived closer. When he was told that the city dump（垃圾场）was overflowing , the goat-keeper said, “No problem. My goats will eat everything in your dump, except the car engines, of course.” So, for another $5,000, the city killed two birds with one stone. If all goes well, they will invite the goat-keeper and his “family” back every three years. The goat-keeper said that he would probably visit San Diego while his goats were in the dump.3. According to the passage, __________.
①
A. the sheepherder offered to do the job for $50,000
②
B. the lowest bid to remove the bushes was $50,000
③
C. the sheepherder and the goat-keeper were both addicted to surfing the Internet
④
D. hiring goats todo the job saved the city government lots of money
【单选题】
阅读理解：阅读下列短文，回答文后问题，选择最佳答案：Goats are being hired to do the work of people near San Diego. The fires that occurred in Hillborbough four years ago destroyed thirty homes, most of which have been rebuilt. While people were rebuilding the homes, the grasses and bushes were growing back. The area is now so overgrown in bushes that there is again a major danger of fire.The city government put up bids to remove the bushes. The lowest bid they received was $50,000—and that was if the city provided breakfast and lunch for the workers for the six weeks it would take to clear the overgrown area. The city only wanted to give unlimited coffee and a piece of bread a day for each person. When that offer was rejected, the city asked for help on its website.A sheepherder in Montanta and a goat-keeper in San Bernardino read about the city’s plight（困境）while surfing the Web. They both offered to do the job for $25,000. The city government chose the goat-keeper because he lived closer. When he was told that the city dump（垃圾场）was overflowing , the goat-keeper said, “No problem. My goats will eat everything in your dump, except the car engines, of course.” So, for another $5,000, the city killed two birds with one stone. If all goes well, they will invite the goat-keeper and his “family” back every three years. The goat-keeper said that he would probably visit San Diego while his goats were in the dump.4.What are the “two birds” that the city government kills with only one stone?
①
A. Both the sheepherder and goat-keeper will work for the city for $25,000.
②
B. The danger of fire and providing breakfast and lunch for the work crews.
③
C. The danger of fire and the overflowing dump.
④
D. The city government can save some money and the goat-keeper has a new job.
【单选题】
阅读理解：阅读下列短文，回答文后问题，选择最佳答案：Goats are being hired to do the work of people near San Diego. The fires that occurred in Hillborbough four years ago destroyed thirty homes, most of which have been rebuilt. While people were rebuilding the homes, the grasses and bushes were growing back. The area is now so overgrown in bushes that there is again a major danger of fire.The city government put up bids to remove the bushes. The lowest bid they received was $50,000—and that was if the city provided breakfast and lunch for the workers for the six weeks it would take to clear the overgrown area. The city only wanted to give unlimited coffee and a piece of bread a day for each person. When that offer was rejected, the city asked for help on its website.A sheepherder in Montanta and a goat-keeper in San Bernardino read about the city’s plight（困境）while surfing the Web. They both offered to do the job for $25,000. The city government chose the goat-keeper because he lived closer. When he was told that the city dump（垃圾场）was overflowing , the goat-keeper said, “No problem. My goats will eat everything in your dump, except the car engines, of course.” So, for another $5,000, the city killed two birds with one stone. If all goes well, they will invite the goat-keeper and his “family” back every three years. The goat-keeper said that he would probably visit San Diego while his goats were in the dump.5.What can be inferred from the passage?
①
A. The city will remove the bushes in this area regularly.
②
B. The goat-keeper asked for $50,000 to kill the birds with stones.
③
C. The goat-keeper was invited to San Diego to do some sightseeing.
④
D. The city government was not kind to the people who worked for it.
【判断题】
阅读课文II. Television and Children,判断正误4. The negative influence of television can be avoided.
①
正确
②
错误
【判断题】
阅读课文II. Television and Children,判断正误1. Television is an excellent invention that may help with education
①
正确
②
错误
【判断题】
阅读课文II. Television and Children,判断正误2. Television companies show only educational programs for children.
①
正确
②
错误
【判断题】
阅读课文II. Television and Children,判断正误3.When a program attracts moderate audiences, it is discountinued.
①
正确
②
错误
【判断题】
阅读课文II. Television and Children,判断正误5.Parents and teachers should control what their chidren watch.
①
正确
②
错误
【单选题】
How are you _____ with your English studies?
①
getting away
②
getting together
③
getting along
④
getting up
【单选题】
I answered the question in two ways, but _____ of them was right.
①
either
②
both
③
none
④
neither