经过锻打或铸造后的齿轮毛坯，需（）处理，使内部组织均匀，具有较好的切削性能。
A.正火
B.调质
C.回火
参考答案：A
The prices of new houses in our city have been ________than before, but they ______ well at
present. [ ]
A. higher, still sell
B. lower, are not still sold
C. higher, don't sell
D. cheaper, are not still sold
煅制药材杂质不得超过（）
A.1%
B.2%
C.3%
D.4%
E.5%
