The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the ()
A. method of supplying air
B. cooling system
C. method of igniting fuel
D. valve operating mechanism
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汇款套餐有效期满后,协议对应的汇款套餐的剩余笔数不作废,系统退回已收取的汇款套餐费用。
A. 正确
B. 错误
下列不属于电流互感器必填项的有()
A. 设备状态
B. 绝缘介质
C. 电压等级
D. 额定电流