为什么一般碎玻璃不参加配合料的混合？
参考答案：
碎玻璃的加入会大量减少混合机的有效空间，降低其调合效能，增加机械磨损，因此应最后加人。
Not only his lesson, but also he often help others with their lessons.[ ]
A. did he do well in
B. he do well in
C. does he do well in
D. he did well in
煮罐法的操作方法不正确的是哪项（）。
A.选用竹罐
B.将罐倒置药液中加热
C.用镊子钳住罐口
D.提出水面甩去水液
E.乘热将罐按在皮肤上吸拔
