保护地栽培黄瓜应在花期每天坚持授粉才能结瓜。

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。

妈妈买了黄瓜、豆角和茄子各用去48.6元、52.4元、78.3元，一共花去（）元。

导致黄瓜苗期发生“寒根”问題的主要原因是（）

导致黄瓜苗期发生“寒根”问題的主要原因是（）。 

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

栽培蔬菜的温室有些什么类型？