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问题 单项选择题

某女，63岁。心脏骤停，面色苍白，神经反射消失，紧急抢救同时进行药物治疗，最有效的药物是

A．阿托品
B．多巴胺
C．利多卡因
D．碳酸氢钠
E．肾上腺素

答案

参考答案：E

单项选择题 A1/A2型题

病例-对照研究的特点不包括（）。

A.属于观察研究

B.设立对照组

C.观察方向由"果"及"因"

D.不能确实证明暴露与疾病的因果关系

E.给予干预措施
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单项选择题

MIDI enables people to use （66） computers and electronic musical instruments. There are actually three components to MIDI, the communications " （67） ", the Hardware interface and a distribution （68） called "Standard MIDI Files". In the context of the WWW,the most interesting component is the （69） Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol （70） are stored in MIDI files, the events are also time-stamped for playback in the proper sequence. Music delivered by MIDI files is the most common use of MIDI today.

A．messages

B．packets

C．frame

D．information
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