多浆植物耐旱性强，在旺盛生长季节需要（）。

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.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

下列花卉为观花木本植物的是（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

勿谄富，勿（）；勿（），勿（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

仙人掌和多浆植物的某些种类有毛刺或白粉，其主要作用是什么（）