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问题 单项选择题 案例分析题

如图所示为最常用的电工测量仪表接入电流互感器方式之一，如电路一次电流对称，三只电流互感器变比均为50/5，二次电流数值为I。

使用钳形电流表测量“①”点值为（）。

A.0

B.I

C.2I

D.3I

答案

参考答案：A

单项选择题

“Cost，Insurance and Freight”means that the seller delivers when the goods pass (1) in the port of shipment．The seller must pay the costs and (2) necessary to bring the goods to the named port of destination．But the risks of loss of or damage to the goods，as well as any additional costs due to events occurring after the time of delivery，are transferred from the seller to the buyer．However，in CIFthe (3) also has to procure insurance against the buyer’s risk of loss of or damage to the goods during the carriage．Consequently，the seller contracts for insurance and pays the (5) ．The CIF term requires the seller to (5) the goods for export．

A．inventory

B．pack

C．load

D．clear
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问答题 简答题

分析各因素对“燃烧前沿速度”和“传热前沿速度”的影响。
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