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1、[单选题]During the power stroke,a force of up to 4000 pounds is suddenly applie
to the piston hea for _______ times a second.
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、[主观题]【英译中】With the introduction of computers and electronic devices,the modern vehicle’s electrical system is becoming more and more complex.
4、[主观题]【英译中】Although the other three strokes are necessary,they are idle strokes.
5、[阅读理解]【单词填空题】Before the comprehensive test, you’d better do some _______ exercise.
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