搜题

【单选题】

Copper is often used as an electrical conductor because it （）.

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

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第1题

[单选题] Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service?（）

A、Copper B、Copper and carbon C、Carbon D、Bronze

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第2题

[判断题] In practice, Community Language Learning is most often used in the teaching of writing skill and the course progression is topic based.（）

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第3题

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A、occasionally B、accidentally C、often D、usually

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第4题

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A、Brass B、Copper C、Lead D、Zinc

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第5题

[单选题] The material used extensively as electrolytic protection around bronze propellers is（）.

A、brass B、copper C、lead D、zinc

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第6题

[] This machine （）out of order very often, but now it works well.

A、A.is used to be B、B.was used to be C、C.used to be D、D.was used to

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第7题

[单选题] When using a lightning arrestor， connect which type of ground wire to a good earth ground？（）

A、#6 solid copper B、#12 solid copper C、#20 solid copper D、#22 solid copper

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第8题

[] Seamless mild steel is used for steam (also copper for moderate pressure and temperature), h-pair, feed discharge and all oil fuel pressure pipingsAccording to the above sentence, which of the following statements is not true?（）

A、A.Both seamless mild steel and copper may be used for middle pressure steam B、B."hpair" means high pressure air C、C.The feed piping of the boilers can be made of seamless mild steel D、D.All oil pipings are made of mild steel

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第9题

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A、UTP B、Coaxial C、Fiber optic D、STP

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