单项选择题
A.(37±2)mm B.(39±5)mm C.(41±5)mm D.(35±5)mm
A.45° B.50° C.6° D.90°
A.6° B.3° C.10° D.0°
A.(410±5)mm B.(440±5)mm C.(420±5)mm D.(450±5)mm
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