— Have you got any carrots?
— No, I _____. [ ]
A. have
B. haven't
C. don't
D. am not
答案:B
灌砂法测定压实度试验检测时应注意哪些问题?
具有使聚集血小板重新解聚作用的药物是()
A、丹参
B、益母草
C、川芎
D、延胡索
E、莪术