连词组句，只写序号。

1. ① What  ② he  ③ wearing ④ is

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2. ① is  ② a  ③ red  ④ She  ⑤ wearing  ⑥ blouse

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3. ① like  ② your  ③ skirt  ④ I  ⑤ green

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4. ① is  ② my  ③ Where  ④ yellow  ⑤ sweater

_______________________________________________________?

5. ① are  ② wearing  ③ What  ④ you

_______________________________________________________?

低压开关、接触器、继电器、主令电器、电磁铁等都属于低压控制电器。