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【单选题】
— Have you returned the library book ? — Yes, I've returned it. [ ]A.
already; already
B.
yet; yet
C.
already; yet
D.
yet; already
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举一反三
【简答题】绘制平行于轴线的螺纹时(非圆视图),外螺纹倒角内部 牙底线,内螺纹倒角内部 ______ 牙底线。 (填写 绘制或不绘制 )
【简答题】Some parents do not ____their children to choose a challenging job instead of a stable one. (courage)
【简答题】绘制平行于轴线的视图,外螺纹倒角内部需要 绘制牙底线,内螺纹倒角内部 ___需要 绘制牙底线。
【单选题】内、外螺纹旋合，旋合部分按 的画法绘制。在平行轴线的视图上，旋合部分的画法：大径绘制粗实线，小径绘制细实线。垂直于轴线的视图上，旋合部分的画法：大径绘制粗实线圆，小径绘制3/4圈细实线圆，且倒角圆不画。
A.
外螺纹
B.
内螺纹
C.
看不见的轮廓线
D.
轴
【简答题】Some parents do not believe their children should ( ) to learn a language other than the one they speak at home.
【简答题】It is stated in the passage that ________. A) some parents are not prepared to have a child B) young couples do not like children at all C) working couples do not have much time to take care of their ...
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