运输包装是以（）为主要目的的包装。
A、运输
B、保管
C、运输十保管
D、运输十销售
参考答案：C
If he ________ well for his lessons yesterday, he ________ so many difficulties now. [ ]
A. had prepared; wouldn't have
B. had prepared; wouldn't have had
C. prepared; wouldn't have
D. prepared; wouldn't have had
下列药物可帮助诊断嗜铬细胞瘤的是（）
A.普萘洛尔
B.去甲肾上腺素
C.组胺
D.哌唑嗪
E.酚妥拉明
