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【简答题】
一条铁路线在空间的位置是用它的线路中心线来表示的，中心线点的位置是在（）中点。
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举一反三
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【单选题】By the time he realizes he _____ a mistake, it’ll be too late for him to change his mind.
A.
makes
B.
made
C.
has made
D.
had made
【单选题】关于点的三面投影规律描述正确的是：( )【图片】
A.
a ¢ a ⊥ OX 轴
B.
a ¢ a ² ⊥ OZ 轴
C.
aa x= a ² a z
D.
a ¢ a ⊥ OX 轴、 a ¢ a ² ⊥ OZ 轴、 aa x= a ² a z，简称“ 长对正、高平齐、宽相等”
【单选题】---Do you mind my smoking here? ---_________, Look at the sign. It says, “No Smoking.”
A.
It doesn’t matter.
B.
No, I don’t.
C.
You’d better not.
D.
Never mind.
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