题目内容
螺纹的五要素是牙型、公称直径、线数、螺距和导程。（ ）
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若使一对内外螺纹能够旋合在一起，螺纹的五要素必须一致。（ ）
when, andDark clouds gathered.The rain hit the hot road.Cars moved slowly in long lines.
but, soI needed butter to make cakes.I couldn’t find any.I used vegetable oil instead.
as, bt, soMy computer was not working this morning.I think it needs to be repaired.I have already had it repaired several times.I don’t think it would help to repair it again.
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