The holding power of an anchor is the（）.
A. maximum sustained vertical load an anchor will resist before dragging
B. maximum sustained horizontal load an anchor will resist before dragging
C. maximum sustained vertical load an anchor will resist before the mooring line breaks
D. maximum sustained horizontal load an anchor will resist before the mooring line break
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政策执行成功的重要手段是（）。
A. 执行者因素
B. 资源因素
C. 执行工具
D. 环境因素
The lifesaving signal indicating You are seen - assistance will be given as soon as possible is the（）.
A. vertical motion of white flags
B. vertical motion of a white light or flare
C. firing of a green star signal
D. None of the above
某孔基本尺寸为30，最大极限尺寸为30.025，最小极限尺寸为29.075，其公差为（）。
A. 0.025
B. ±0.025
C. 0.050
D. －0.025
检定/校准证书的有效性就是时间的有效性，检定/校准证书必须在检定有效期内。
A. 正确
B. 错误
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