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【多选题】
半径规可以测量（ ）。A.
零件外圆角半径
B.
零件内圆角半径
C.
零件角度
D.
零件厚度
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皮皮学刷刷变学霸
举一反三
【单选题】He looked rather untidy as there were two buttons _____ from his coat.
A.
loosing
B.
losing
C.
off
D.
missing
【单选题】It was surprising that the hotel looked rather shabby outside was luxuriously and ______ furnished inside.
A.
artificially
B.
arrogantly
C.
arbitrarily
D.
artistically
【单选题】It was surprising that the hotel that looked rather shabby outside was luxuriously and ______furnished inside.
A.
artificially
B.
arrogantly
C.
arbitrarily
D.
artistically
【简答题】已知边长为a的等边三角形内任意一点到三边距离之和为定值，这个定值为 ，推广到空间，棱长为a的正四面体内任意一点到各个面的距离之和也为定值，则这个定值为：
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