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[单选题]

In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）

A . The safety valve escape piping should be disconnected from the valve body and a blank inserted

B . The boiler vent valves should be opened

C . All handhole/manhole covers should be tightened up as much as possible to preclude any leaks

D . All of the above

参考答案与解析：

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