磺化车间使用的往复泵有()。
A.不合格酸计量泵
B.磺化冷却水泵
C.磺酸输出泵
D.热水循环泵
参考答案:A
----How amazing, Sara! You are used to going to bed early and getting up early these days.
----_______ And I hope you can lead such a healthy life, too.
A.So do I
B.So I do
C.So I am
D.Thanks a lot
工程中将压杆()状态相对应的压力临界值称为临界力。
A.承载能力极限
B.正常使用极限
C.强度极限
D.临界平衡状态