In launching a lifeboat，when should the tricing pendants be released?（）.
A. Before the boat is lowered from the stowage position
B. As soon as the boat-fall blocks clear the davit head
C. After the limit switch is activated
D. After all people have been embarked
当（）时，人体各器官机能逐渐下降，使人体逐渐变得衰老
A. 同化作用大于异化作用
B. 异化作用大于同化作用
C. 同化作用与异化作用趋于平衡
D. 同化作用与异化作用均减弱
购建项目获批后（）个月内，应开工建设或签订购房合同。
A. 3
B. 4
C. 5
D. 6
建立一个网站如同开发软件一样，一般按哪几个步骤进行？
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