在Photoshop中坐标原点一旦被改动是不可以被复原的。
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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
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
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