Electric cargo winches have an overload safety device which normally cuts the current to the winch motor().
A. after torque causes line pull to exceed the rated capacity of the winch
B. before the line pull reaches the rated capacity of the winch
C. when the line pull reaches the breaking strength of the fall
D. before the safe working load of the fall is reached
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独舞《春江花月夜》首演时的表演者是()。
A. 栗承廉
B. 陈爱莲
C. 戴爱莲
D. 舒巧
在WindowsXP中,启动应用程序的正确方法是()
A. 将鼠标指向应用程序图标
B. 将应用程序最小化成图标
C. 用鼠标双击应用程序图标
D. 将最大化或最小化的应用程序窗口还原