Sandy usually has lunch at school, _____ she? [ ]
A. doesn't
B. did
C. didn't
D. does
答案:A
治疗HIV感染的首选药是()
A.干扰素
B.利巴韦林
C.阿昔洛韦
D.齐多夫定
E.阿糖胞苷
HS液压油适用于温度在()以上的野外液压设备。
A.-10℃
B.-20℃
C.-30℃
D.-40℃