单项选择题
A.has high resistance at low temperatures B.has a highly polished surface C.is able to pass current with little opposition D.holds insulation together well
A device which prints out a permanent record of the pla...
单项选择题A device which prints out a permanent record of the plant operating conditions is known as the （）.
A.analogger B.bell logger C.alarm logger D.data logger
Which of the following types of motors is often designe...
单项选择题Which of the following types of motors is often designed for use in correcting power factor?（）
A.Polyphase B.Wound-rotor C.Induction D.Synchronous
Power transformers are rated in （）.A.kilowattsB.ampere-...
单项选择题Power transformers are rated in （）.
A.kilowatts B.ampere-turns C.kilowatt-volts D.kilovolt-amperes
