单项选择题
A.1＂ B.2＂ C.3＂ D.4＂
A.30° B.45° C.60° D.90°
A.0.002 B.0.003 C.≤0.001 D.≤0.01
A.≤0.001 B.≤0.01 C.≤0.005 D.≤0.002
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