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【判断题】

外螺纹的顶径是大经,内螺纹的顶径是小径。

A.
正确
B.
错误
举报
参考答案:
参考解析:
.
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【单选题】HorsesWheneveranyone asks me what my favorite animal is, I always say, "Horses," I like almost all animals. _____(26)I don't have a horse of my own. Horses are very expensive. _____(27) You have to pa...

A.
There I could be around horses all the time.
B.
We're very lucky to live near a horse stable.
C.
It's very expensive to buy one and to own one.
D.
But horses have always been my very favorite animals.
E.
My favorite horse "Vrana" is older than a lot of other horses.
F.
For example, a horse is happy if its ears are forward and its tail is relaxed.

【单选题】外螺纹的规定画法是( )。

A.
小径为粗实线,大径为细实线
B.
大小径都为粗实线,
C.
大小径都为细实线,
D.
大径为粗实线,小径为细实线

【单选题】国标规定,外螺纹的小径画为()。

A.
细实线;
B.
粗实线;
C.
虚线;
D.
点划线。