当温度升高时，（）的粘度降低。
A、油品中只有烷烃
B、油品中只有芳香烃
C、油品中只有烯烃
D、油品中所有馏分
参考答案：D
She said she her new computer for only a week. [ ]
A. has bought
B. had bought
C. has had
D. had had
下列哪味是治疗梅毒的药物（）
A.马钱子
B.黄连
C.轻粉
D.硼砂
E.蛇床子
