矿井主要进风巷的风速一般不大于（）m/s。

采煤工作面至少要有几条进风巷和回风巷（）。

安设局部通风机的进风巷道所通过的风量要（）局部通风机吸风量。

安设局部通风机的进风巷道所通过的风量要（）局部通风机吸风量

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

采煤工作面进风巷水幕应设在工作面进风巷风流汇合点以外。（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。