题目内容

His expenditure on clothes and luxuries is rather high________(和他每月收入相比)．

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If you bum just 250 calories per day through exercise, it cannot have an important effect on your weight.

There was a knock at the door．It was the second time someone___________(那晚打扰我)．

电动机变频调速系统主要包括异步电动机、变频器、负载及传动机构几部分外，还包括哪个部分。()
A控制环节
B变压器
C变速器
D调频器

it can have a 9 effect on their kids.