气焊工艺参数有______、______、______和______等。
参考答案：焊丝直径；火焰性质及能率；焊嘴倾角；焊接速度
The new teacher is quite ____ Mr Wang. I like her better.
A．different from
B．the same as
C．difference
D．the same to
各色碧玺中，宝石级的（）碧玺包裹体较少。
A.红色
B.蓝色
C.绿色
D.双色
