【单选题】【消耗次数：1】
设备外部检修、动火时，设备内的可燃气体浓度应低于安全值。（ ）
①
正确
②
错误
参考答案：
复制
纠错
相关题目
【单选题】
在化工生产中，用于扑救可燃气体、可燃液体和电气设备的起初火灾，应使用（ ）。
①
干粉灭火器和泡沫灭火器
②
“l211”灭火器
③
“l301”灭火器
④
酸碱灭火器
【单选题】
适用于扑灭可燃固体(如木材、棉麻等)、可燃液体(如石油、油脂等)、可燃气体(如液化气、天然气等)以及带电设备的初起火灾的灭火器是( )灭火器。
①
干粉
②
酸碱
③
清水
④
泡沫
【单选题】
在化工装置停工检修工程中，将检修设备与其他设备有效隔离是保证检修安全的重要措施。通常是在检修设备与其他设备之间的管道法兰连接处插入盲板以实现隔离的目的。下列有关盲板的说法中，错误的是（ ）。
①
盲板应该是一块椭圆形的金属板，以方便安装
②
盲板的尺寸应符合阀门或是管道的口径
③
盲板垫片的材质应根据介质的特征、温度、压力选定
④
盲板的材质应根据介质的特征、温度、压力选定?
随机题目
【单选题】
Her parents objected to ____ that farmer, though he has a lot of money.?
①
her marrying ?
②
marrying ?
③
marry ?
④
her marrying with?
【单选题】
Tom, what did you do with my documents? I have never seen such a____ and disorder!
①
mass
②
mess
③
guess
④
bus
【单选题】
—Could I borrow your dictionary? —I’d get it for you ____I could remember who last borrowed it.
①
except that
②
unless
③
only if
④
if only
【单选题】
No one thought that John’s suggestion was worth ____.?
①
?to consider ?
②
considering ?
③
to be considered ?
④
of consideration?
【单选题】
We must ____ that our customs and habits are different from theirs.
①
keep up with
②
bring forward
③
keep in mind
④
come true
【单选题】
20. Only when he had handed in his exam paper ____ he had made several mistakes.
①
he has realized
②
does he realize
③
has he realized
④
did he realize
【单选题】
People’s hearts ____ the children whose parents died in the accident.
①
went out for
②
went out with
③
went out to
④
went out of
【单选题】
A sudden idea ____ to him that he might try the new method.
①
occurred
②
happened
③
took place
④
took part
【单选题】
“Can I help you?” “Well, I’m afraid the box is too heavy for you, ____ thank you all the same.”
①
and
②
so
③
but
④
or