货物装船后由承运人或其授权代理人根据大副收据签发给托运人的提单是（）
A.清洁提单
B.不清洁提单
C.已装船提单
D.收货待运提单
参考答案：C
三角形的面积一定，它的底和高成反比例．______．
- ?
- He is short and he has big eyes and a small nose. [ ]
A .Where is the boy from
B. What does the boy look like
C. What class is the boy in
