单项选择题
A.错开 B.平行 C.重叠 D.隔开
A.60S B.90S C.120S D.150S
A.光滑面、凹槽 B.光滑面和键槽 C.粗糙面和键槽 D.粗糙面和凸槽
A.平模；内叶 B.立模；内叶 C.平模；外叶 D.立模；外叶
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