机动车在城市道路上载运超限的不可解体的物品行驶时，应当按照公安机关交通管理部门指定的时间、路线、速度行驶并悬挂明显标志，（）。
A. 法律、法规另有规定的，从其规定。
B. 有其它规定的，按其它规定。
C. 有其它规定的，还是按公安机关交通管理部门指定的规定。
D. 谁都不能改变其原有的规定。
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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
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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