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【判断题】
当采用TIG焊,在使用交流电时,钨极端部磨成锥台形;在使用直流电时钨极端部应磨成半球形。
A.
正确
B.
错误
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B.
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C.
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【单选题】—Mom,dad is smoking again! —Well,let him cut it ________ gradually since old habits die hard.
A.
off
B.
down
C.
up
D.
out
【单选题】— Mom,Dad is smoking again! — Well, let him cut it ________ gradually since old habits die hard. [     ]
A.
off
B.
down
C.
up
D.
out
【判断题】局部变量名必须以@@开头。
A.
正确
B.
错误
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