无功自动补偿宜采用功率因数调节原则，并要满足电压变动率的要求。()
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【C11】______
A. cites
B. recommends
C. finds
D. quotes
Customers trading abroad in foreign currencies may protect against the exchange risk by arranging______.
A. a contract of international sale of goods
B. a contract of marine insurance
C. a forward contract to fix the exchange rate in advance
D. a contract for the delivery of goods by instalments
两班制生产的设备约()个月进行一次定期维护。
A. 1
B. 2
C. 3
D. 4
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