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【单选题】
细点画线用于表达轴线及( )。A.
对称中心线
B.
相邻辅助零件的轮廓线
C.
尺寸线
D.
剖面线
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举一反三
【简答题】A．They are strangers. B．They are colleagues. C．They are friends. D．They are neighbors.
【简答题】A．They are scientific. B．They are sarcastic. C．They are unbelievable. D．They are reasonable.
【单选题】A) They are twins. B) They are classmates. C) They are friends. D) They are colleagues.
A.
They are twins.
B.
They are classmates.
C.
They are friends.
D.
They are colleagues.
【简答题】A．They are inspiring. B．They are humorous. C．They are dull. D．They are wonderful.
【简答题】纯弯曲梁横截面上只有____应力。中性轴上各点的正应力为____,离中性轴最远的点的正应力最大,即正应力与该点到中性轴的距离成____。
【简答题】A．They are walking. B．They are drinking. C．They are watching TV. D．They are studying.
【简答题】A．They are tour guides. B．They are salespersons. C．They are tourists. D．They are engineers.
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