When launching an open lifeboat by falls，the boathooks should be（）.
A. secured forward and aft where readily available
B. secured amidships where they will not hinder the personnel
C. used for fending off
D. used for picking up survivors in the water
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引起汽车进行悬架刚度和阻尼系数控制时，只在防侧倾时不起作用的原因是（）
A. 转向传感器故障
B. 节气门位置传感器故障
C. 车速传感器故障
D. 开关故障
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