题目内容

I need to _________ on my essay, so I cannot go to the party tonight

A. offer
B. fire
C. focus
D. private

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This coat is too big, so I need to __________ a new one.

A. couple
B. apologize
C. fire
D. purchase

My favourite way to ______________ with people is by texting them.

A. couple
B. communicate
C. fire
D. offer

柴油机高压共轨喷油系统解决了传统喷油系统中的( )固有缺陷。

A. 系统刚度大
B. 喷油压力过大
C. 低速扭矩和低速烟度差
D. 热效率低

柴油机的供油规律基本由()和()决定,也称为几何供油规律。

A. 柱塞直径
B. 凸轮几何尺寸
C. 喷油规律
D. 喷油始点

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