钩尾扁销的作用是联接钩舌与钩体，防止列车分离。_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题判断题

钩尾扁销的作用是联接钩舌与钩体，防止列车分离。

答案

参考答案：错

补全对话，情景问答

读问句，选出合适的答语。

( ) 1. What's this?
( ) 2. Where is north?
( ) 3. What country is west of China?
( ) 4. What do they speak in Mexico?
( ) 5. What colour is it?

A. North is up.
B. It's the U. K.
C. English.
D. It's a tree.
E. It's black.

填空题

按成分分类钢可分为（）、（）。