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【单选题】
螺纹代号 G1/4 中, G 是 的螺纹特征代号 。A.
55°非密封管螺纹
B.
55°密封管螺纹
C.
锯齿形螺纹
D.
普通粗牙螺纹
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反馈参考答案：
举一反三
【简答题】不超过八度的音程叫 ,超过八度的音程的叫 。
【简答题】成语 “白驹过隙”比喻
【单选题】A 43-year-old woman has become increasingly tired and listless over the past 5 months. She has had menometrorrhagia for the past 3 months. On physical examination, there are no remarkable findings exc...
A.
Mutation in a DNA mismatch-repair gene
B.
Germline inheritance of APC gene mutation
C.
Tyrosine kinase activation owing to c-KIT mutation
D.
Homozygous loss of PTEN gene
E.
Inactivation of the Rb protein by HPV-16
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