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什么是广告经营资格检查？

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轴流泵的导叶体只能增加水流流速，不能改变水流方向。

A. 正确
B. 错误

（）of the following statements is incorrect regarding a fire and boat drill ao board your cargo vessel.

At least one fire and drill shall be held within 24 hours of leaving a port where more than 25 percent of the crew has been replaced
B. The Master is responsible in seeing thst each lifeboat is lowered to the water at least once in each 6 months
C. Lifeboat equipment shall be examined at least once each month to insure that it is complete
D. An entry shall be made in the vessels official Logbook relative eo each fire and boat drill

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楼梯栏杆扶手的高度一般为900mm，供儿童使用的楼梯应在高度为（）处增设扶手。

A. 400～500mm
B. 500～600mm
C. 600～700mm
D. 700～800mm

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在PowerPoint应用程序窗口工具栏中，“新建”和“新幻灯片”按钮的区别是什么？

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