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【单选题】
通常情况下,电力电子器件的功率损耗主要成因是A.
通态损耗
B.
断态损耗
C.
开通损耗
D.
损耗
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A.
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【单选题】Under payment in advance, the importer makes _______ to the supplier before the shipment of goods is done.
A.
full payment
B.
partial payment
C.
no payment
D.
most payment
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