（）和（）是铸件中特有的缺陷。
参考答案：缩孔；冷隔
The boy likes playing jokes on his classmates, __________ of course makes him popular.
A．which
B．whom
C．for which
D．for whom
禁用或慎用于青光眼患者的药物是（）
A.颠茄
B.阿托品
C.毛果芸香碱
D.山莨菪碱
E.东莨菪碱
