栓剂油脂性基质
A.蜂蜡 B.羊毛脂 C.甘油明胶 D.半合成脂肪酸甘油酯 E.凡士林
参考答案:D
A.I= ,从上向下
B.I= ,从上向下
C.I= ,从下向上
D.I= ,从下向上
The number of articles published on smoking _____ amazing.[ ]
a. is
b. are
c. were
d. have been