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【判断题】
电能属于二次能源A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】电子商务按照商务活动的运作方式分为【1】和间接电子商务。
【简答题】Levy wondered if the new therapy would __________ the live of the patients . (length)
【单选题】测汞仪在测定时,数字显示不稳定的故障主要原因有吸收池被污染、信号放大输出故障和( )等。
A.
管路不严密
B.
还原瓶体系不配套
C.
气压不足
D.
汞灯供电电源电压不稳定
【单选题】______any trouble with the boiler, the automatic controlling unit will cut off the fuel oil supply.
A.
There should be
B.
If there had been
C.
Should there be
D.
If there was
【单选题】What fuel is the dominant fuel in New England?
A.
Gas.
B.
Electricity.
C.
Wood.
D.
Oil.
【单选题】Heavy soot accumulations in an auxiliary boiler could be caused by .
A.
water in the fuel oil
B.
excessive cycling
C.
high fuel oil pressure
D.
improper burner maintenance
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