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班主任工作应从、、指导班级活动搞好班级管理着手

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铸锭中化学成分不均匀的现象称为全析（）

______ is recognized as the national flag-carrier.

A. The private airline
B. The public airline
C. The chartered airline
D. jet airline

I _____ the party much more if there hadn’t been quite such a crowd of people there.

A. would enjoy
B. will have enjoyed
C. could have enjoyed
D. will be enjoying

伺服电动机在自动控制系统中作用是（）

A. 反馈元件
B. 放大元件
C. 执行元件