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问题 单项选择题

新生儿胎龄40周，出生时Apgar评分3分，生后出现呻吟、呼吸困难，胸部X线检查表现为肺气肿伴节段性肺不张。最可能的诊断为下列哪一项()

A.湿肺

B.胎粪吸入综合征

C.新生儿肺透明膜病

D.感染性肺炎

E.持续性肺动脉高压

答案

参考答案：B

单项选择题

人工呼吸每分钟应为（）

A.12～14次

B.16～18次

C.18～20次

D.20～22次
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单项选择题 共用题干题

Both bus and tree topologies are characterized by the use of multipoint (1).For the bus, all stations attach, through appropriate hardware (2) known as a tap, directly to a linear transmission medium, or bus. Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the(3). A transmission from any station propagates the length of the medium in both directions and can be received by all other  (4). At each end of the bus is a (5) , which absorbs any signal, removing it from the bus.

空白（1）处应选择（）

A.medium

B.connection

C.token

D.resource
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