【判断题】【消耗次数：1】
液流流经薄壁小孔的流量与 小孔通流面积 的一次方成正比，与 压力差 的1/2次方成正比。通过小孔的流量对 温度 不敏感，因此薄壁小孔常用作可调节流阀。
①
正确
②
错误
参考答案：
复制
纠错
相关题目
【判断题】
通过固定平行平板缝隙的流量与 压力 一次方成正比，与 间隙 的三次方成正比，这说明液压元件内的 配合间隙 的大小对其泄漏量的影响非常大。滑阀的中位机是能三位滑阀在中位时各油口的连通方式，它体现了换向阀的控制机能。
①
正确
②
错误
随机题目
【单选题】
8.Doctors ___ in every part of the world.
①
need
②
are needing
③
are needed
④
will need
【单选题】
3. This English song___ by the girls after class.
①
often sings
②
often sang
③
is often sang
④
is often sung
【单选题】
9.His new book___ next month.
①
will be published
②
is publishing
③
is being published
④
has been published
【单选题】
5 -Id like to buy that coat. -Im sorry. ___.
①
it sold
②
its selling
③
Its been sold
④
it had been sold
【单选题】
7.The key ___ on the table when I leave.
①
was left
②
will be left
③
is left
④
has been left
【单选题】
10. These papers___yet.
①
have not written
②
have not been written
③
has not written
④
has not been written
【单选题】
1. The Peoples Republic of China ___ on October 1, 1949.
①
found
②
was founded
③
is founded
④
was found
【判断题】
阅读课文II.Which Is Stronger? 判断正误4. According to the Text, the Wind was a nice person who alwyas had a kind word for everyone.
①
正确
②
错误