采用无纺布作倒滤层材料时,其单位面积质量宜为()g/m2。
A.100~300
B.200~400
C.300~500
D.400~600
参考答案:C
He is always able to make us _____ in class. We usually feel happy while learning English. [ ]
A. laugh
B. to laugh
C. laughing
D. to laughing
高血压病伴痛风的禁用药物为|
A.氨氯地平
B.卡托普利
C.双氢克尿噻
D.美托洛尔
E.哌唑嗪