下列痤疮愈后不留瘢痕的是（）
A.聚合性痤疮
B.结节性痤疮
C.囊肿性痤疮
D.坏死性痤疮
E.以上都不是
参考答案：E
Wouldn’t you feel rather________if you rushed to the airport to meet your friends only to find that they
had already been picked up by other people?[ ]
A. satisfied
B. happy
C. annoyed
D. bored
飞行器按大类可区分为：航空器、航天器、（）。
