信息移频轨道电路可满足()大牵引电流的抗干扰要求。
A. 500A
B. 1000A
C. 1500A
D. 2000A
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电子商务变原来的()交易模式,为现在的()交易模式。
A. 填鸭式,个性化
B. 填鸭式,推式
C. 拉式,推式
D. 个性化,填鸭式
Which of the following may cause that the compressor cuts off on high pressure cutout in a refrigeration plant? () (1) faulty condensing (2) too few refrigerant (3) high discharge pressure
A. any of (1) and (3)
B. any of (1) and (2)
C. any of (2) and (3)
D. any of (1), (2) and (3)