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【简答题】
某工厂为了控制乙炔发生炉内的压力不超过 13.3 kPa (表压),在炉外装一安全液封管(又称水封)装置,如本题附图所示。液封的作用是,当炉内压力超过规定值时,气体便从液封管排出。试求此炉的安全液封插入槽内水面下的深度 h()m(保留2位有效数字) 。
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反馈参考答案：
举一反三
【单选题】I won’t watch the TV play if my father ________ me do my homework. [ ]
A.
let
B.
will let
C.
won’t let
D.
lets
【单选题】If my father here last night, he me from going.
A.
had been;would have prevented
B.
had been;would prevent
C.
were;would
D.
were;would have prevented
【单选题】If my father ______ here yesterday, he would have stopped me from going surfing.
A.
had been
B.
were
C.
should be
D.
has been
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