在标准蜗杆传动中，蜗杆头数z1一定时，若增大蜗杆直径系数q，将使传动效率（）。

在标准蜗杆传动中，蜗杆头数一定，加大蜗杆特性系数，将使传动效率（）

在蜗杆传动中，如果模数和蜗杆头数一定，增大蜗杆分度圆直径，将使（）

蜗杆传动的机械效率主要取决于蜗杆的头数。

试述蜗杆传动中滑动速度的涵义。弧面蜗杆传动与普通蜗杆传动相比有哪些特点？

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。