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1、[单选题]______ makes the piston to move up an down in the engine cylinder.
2、[主观题]【英译中】The burning of air-fuel mixture makes the pistons move up and down,then turn the crankshaft around.
3、[阅读理解]【单词填空题】The electrical charge can be either ______ or negative such that like charges repel and opposite charges attract.
4、[阅读理解]【单词填空题】The company is taking a new measure to ______ their export trade.
5、[阅读理解]【单词填空题】 Who is responsible for the ______ of military supplies?
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