题目内容

热缩管紧固的导线具有防水的特性。

A. 对
B. 错

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导线的敷层一般为易燃材料。

A. 对
B. 错

The writer tried a MOOC that his friend suggested because it was cheap and possible ________.

A MOOC is a course in which you may find a lot of subjects and _________to know what the course is like.

People who read everything on the forums won’t have time to finish the lectures, for ___________.

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