桥梁养护工程师实行分级管理责任制，实行“（）”的原则。
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普通的旋塞阀可安装于任何位置，但必须安装在容易观察塞子方头上的沟漕处。
A. 正确
B. 错误
长沙市对重点污染源及其污染防治设施的现场监察次数是每月1次还是不少于1次？
If there are a number of survivors in the water after abandoning ship，they should（）.
A. tie themselves to the unit so they won't drift with the current
B. form a small circular group to create a warmer pocket of water in the center of the circle
C. send the strongest swimmer to shore for assistance
D. form a raft by lashing their life preservers together
测量木材标准强度的含水率指标是15%。
A. 正确
B. 错误
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