单项选择题
A.横轴垂直于竖轴 B.视准轴垂直于横轴 C.水准管轴垂直于竖轴 D.视准轴垂直于竖轴
A.8″ B.9″ C.13″ D.24″
A.45° B.90° C.180° D.270°
A.0°或稍大处 B.90°或稍大处 C.135°或稍大处 D.180°或稍大处
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