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【单选题】
若拉深件底部周边形成鼓囊或胀大时,可在( )。A.
凸模上加大出气孔
B.
凸模上减小出气孔
C.
凹模上加大出气孔
D.
凹模上减小出气孔
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【单选题】Because the supply of natural gas was plentiful in comparison to other choices like coal and fuel oil, and because it burns cleaner, many people changed their heating systems to natural gas. Why did p...
A.
It was natural.
B.
There were no other choices.
C.
The other fuels were dirtier and less plentiful.
D.
There is, even today, a plentiful supply of it.
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