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问题 单项选择题

关于雷诺现象的叙述，正确的叙述是

A．受寒冷刺激后，手指、脚趾皮肤先苍白，后变紫、潮红，伴疼痛和麻刺感
B．仅见于系统性血管炎
C．病理基础是血管机械性狭窄
D．手指遇冷疼痛是其特点
E．多伴随其他临床症状，很少单独出现

答案

参考答案：A

单项选择题

which descnption is NOT true

A． Personal computer has not the features of the larger system．

B． Large systems offer higher processing speeds for user and return more data than PCs．

C． Output devices take output results from the CPU in machine-coded form and conven them into a form that used by people.

D． The input/output devices and auxiliary storage units of a computer system are called peripherals.
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单项选择题

下面对健康的描述正确的是（）。

A.躯体没有疾病

B.身体强壮，性格开朗

C.生理和心理上的完好状态，而不仅仅是没有疾病

D.一种生理、心理健康，社会适应良好的完美状态，而不仅仅是没有疾病或体弱

E.以上都不对
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