题目内容

信号控制(名词解释)

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层门口净宽度(名词解释)

三向开门(名词解释)

有凝结盖的铁水罐,不应鼓盖操作用氧烧盖时,专用胶管和钢管应不短于()m,管接头无泄漏,防止回火。

A. 10
B. 5
C. 8
D. 4

学习与课外
For this part, you are allowed 30 minutes to write an essay on how to balance academic study and extracurricular activities。 You should write at least 150 words but no more than 200 words。

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