集装箱按用途分，可分为（ ）。
A．普通货物集装箱
B．特种货物集装箱
C．航空集装箱
D．框架集装箱
参考答案：A,B
— May! How is your plan? I heard you started it last Sunday.
— Oh! I _____ for it, but I haven't decided where to start it. [ ]
A. have prepared
B. had prepared
C. have been preparing
D. was preparing
肺部叩诊呈过清音的是（）
A.肺气肿
B.大量胸腔积液
C.气胸
D.支气管肺炎
E.肺空洞
