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【判断题】
柴油机按工作循环分四冲程和二冲程。()A.
正确
B.
错误
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【判断题】Chemical milling is controlled etching process using strong alkaline or acid etchants. Aluminum, titanium, magnesium, and steel are the principal metals processed by this method. 化学蚀刻,通过使用强碱或强酸蚀刻剂来控制蚀...
A.
正确
B.
错误
【单选题】There ____ no buses, we had to walk home after work yesterday.
A.
was
B.
were
C.
being
D.
had
【简答题】Aluminum 是什么金属?
【单选题】_______ no buses , we have to walk home
A.
There were
B.
There being
C.
It was
D.
It being
【简答题】Aluminum 是哪种金属?
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