题目内容

中埋式止水带应与防水板焊接，止水条不得受潮；背贴式止水带接头连接应采用热接，不得叠接。

A. 对
B. 错

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喷锚支护地段围岩局部集中漏水时，应在喷锚前采取措施将水封堵或集中引排。

A. 对
B. 错

中心排水管的管材应符合国家标准《混凝土和钢筋混凝土排水管》（GB/T11836-1999）三级管的要求。

A. 对
B. 错

Never ________ even when you are sad, because you never know who is falling in love with your smile!

A. knit
B. frown
C. known
D. crown

The next morning some experts were sent to ________ the damage caused by the flood.

A. survey
B. research
C. study
D. investigate