4.为什么说中国共产党的成立是开天辟地的大事变?

Can I （）a message or would you like to ring him on his mobile phone? 

 ______ twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.

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.

中国共产党第一次全国代表大会的召开标志着中国共产党的（），毛泽东同志指出：“中国产生了共产党，这是开天辟地的大事变。”

中国共产党诞生于（）年，这是中国历史上开天辟地的大事。

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。