四川大学第一位外籍理学博士是来自巴基斯坦的（）
A.阿尔
B、艾维
C、阿里
D、居里
参考答案：C
Her hands________rough.She must have done a lot of heavy physical work.[ ]
A. were felt
B. are felt
C. are feeling
D. feel
试验制动机缓解时应鸣示缓解信号二短声。
