锅炉水压试验时应在周围气温（室内）高于（）℃时进行。若在气温

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问题单项选择题

锅炉水压试验时应在周围气温（室内）高于（）℃时进行。若在气温低于该温度的环境中进行水压试验时，必须采取可靠的防冻措施。

A.0

B.5

C.10

D.20

答案

参考答案：B

选择题

— Where do kangaroos live?

— They live in _____________.[ ]

A. China

B. Canada

C. Australia

选择题

There ________ lots of trees on both sides of this street.But now they are all gone.

A．used to have

B．are used to be

C．used to be

D．are used to have