什么电源可以作为电爆网路起爆电源？对有煤尘（含矿尘）和气体爆炸危险的矿井的起爆电源有什么特殊规定？

硐室爆破实施时，起爆网路与起爆电源之间要设中间开关，在下达“（）”命令前，电爆网络主线不得与起爆电源相连，电源开关应装入箱体锁好并由专人保管钥匙。

发爆器是用于起爆炸药的起爆电源。

在竖井爆破作业中，使用电力起爆网路时，为避免（）对爆破的影响，在电雷管进入井底爆破场地前，应切断井下电源，严禁电雷管进场后再排水。

在竖井爆破作业中，使用电力起爆网路时，为避免()对爆破的影响，在电雷管进入井底爆破场地前，应切断井下电源，严禁电雷管进场后在排水。

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。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。