含马兜铃酸,使用时注意对肾脏的损害()
A.二冬
B.二术
C.二母
D.二活
E.二枫藤
参考答案:A
I _____ have a business trip to Hong Kong tomorrow. Can you help me prepare for it? [ ]
A. Have gone to
B. am going to
C. was going to
D. have been to
色谱仪放空管线是否需要引到仪器房外?为什么?