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【单选题】
Refer to the following figure when answering the next three questions (4 through 6). This diagram depicts a block sliding along a frictionless ramp. The eight numbered arrows in the diagram represent directions to be referred to when answering questions 4–6 The direction of the acceleration of the block, when in position P, is best represented by which of the arrows in the diagram?A.
Arrow 1
B.
Arrow 2
C.
Arrow 4
D.
Arrow 5
E.
None of the arrows, the acceleration is zero.
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【简答题】在带电的电压互感器二次回路上作业时,连接的临时负荷,在互感器与负荷设备之间必须有专用的 和熔断器。
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