问题
单项选择题
二冲程柴油机与四冲程机比较，不正确的是（）。
A．转矩比四冲程机均匀
B．功率为四冲程机的两倍（1.6—1.8）
C．换气质量比四冲程机差
D．同功率时，尺寸与重量比四冲程机小
答案
参考答案：B
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二冲程柴油机与四冲程机比较，不正确的是（）。
A．转矩比四冲程机均匀
B．功率为四冲程机的两倍（1.6—1.8）
C．换气质量比四冲程机差
D．同功率时，尺寸与重量比四冲程机小
参考答案：B
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| There are many people in the world now. There 1 a lot more people next century. So the earth will be very 2 and there will be a little room for each person. Maybe there will be only 3 room on the earth in 600 years. That will be a very serious 4 . So man is 5 of a way to solve the problem. The moon is the satellite (卫星) of the earth. Man will probably go to 6 there some day. But there is no air, no plants and no life on the moon. So 7 are doing experiments in many ways. They 8 solve many problems 9 man can live on the moon. I'm sure our dream will 10 next century. Do you think so? | ||||
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