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拖动暖通水管道支管热夹点至主管道侧边时，不能直接生成三通。

答案：错误

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国际贸易单证制作的基本要求是_, _,__,_,____.

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单项选择题

Which one is not true about six criteria for evaluating how communicative classroom activities are? ( )
A. The activity should involves the students in performing a real communicative purpose rather than just practicing language for its own sake.

B. When students are doing the activity. They must focus on the form, not on the meaning.

C. The activity must be designed to be done by students working by themselves rather than with the teacher.

D. The activity should not be designed to control what language the students should use.