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问题 单项选择题 A2型题

男性，32岁，反复上腹痛二年余，向背部放射，夜间加重，曾二次大出血，经抢救治愈，最可能的诊断是（）

A.十二指肠球部溃疡

B.胃溃疡

C.幽门管溃疡

D.球后溃疡

E.胃癌

答案

参考答案：D

解析：球后溃疡夜间加重并向背部放射。

单项选择题

人防工程内医院的位于袋形走道两侧或尽端的房间，其房间门至最近安全出口的最大距离为（）。

A．10m 

B．12m 

C．24m 

D．30m
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单项选择题

A first-grade teacher use ten flash cards, numbered 1 through 10, to teach her students to order numbers correctly. She has students choose four flash cards randomly, then arrange the cards in ascending order. One day, she removes the cards numbered "2" and "4" from the deck of flash cards. On that day, how many different correct arrangements of four randomly selected cards are possible

A．70

B．210

C．336

D．840

E．(E) 1,680
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