减少焊接热输入，能防止结构产生脆性断裂。（）

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问题判断题

答案

参考答案：对

选择题

选出下列每组中不同类的单词。
( )1. A. lake ( )2. A. lion ( )3. A. red ( )4. A. six ( )5. A. this	B. have B. wolf B. blackboard B. five B. English	C. food C. dress C. chair C. fine C. that

选择题

Only in recent years ______ begun to realize that wild dogs, kept within bounds, often do more good than harm.

A．people have

B．since people have

C．have people

D．people who have