变频式能量调节是用改变电动机（）的方法来改变压缩机的转速。
A. 供电电压
B. 供电电流
C. 供电频率
D. 供电相位
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In GLBP, which router will respond to client ARP requests?（）
A. The active virtual gateway will reply with one of four possible virtual MAC addresses.
B. All GLBP member routers will reply in round-robin fashion.
C. The active virtual gateway will reply with its own hardware MAC address.
D. The GLBP member routers will reply with one of four possible burned in hardware addresse
起钻时，从井内每起出（）柱钻杆必须向井内灌一次钻井液。
A. 10～15
B. 8～9
C. 6～7
D. 3～5
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