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