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问题 单项选择题

落辙车复轨前，在本列车后必须设置专人截车或在车尾（）米以外挂红灯示警。

A、20

B、50

C、40

D、50

答案

参考答案：A

单项选择题

尿沉渣镜检细胞时，要以观察的高倍视野是

A．3个

B．20个

C．10个

D．5个

E．15个
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单项选择题

Mark Williamson is "bearish" on ABC Manufacturing Company. Williamson is so convinced that ABC is overpriced, two weeks ago, he shorted 100000 shares. Today, Williamson is "surfing" several popular investment bulletin boards on the internet and posting false derogatory comments about company management. According to Standard Ⅱ (B), Market Manipulation, Williamson has engaged in:（）

A. transaction-based manipulation, but not information-based manipulation. 

B. both transaction-based manipulation and information-based manipulation. 

C. information-based manipulation, but not transaction-based manipulation.
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