判断题

71. 使用钻床工作时，应全面检查钻床、工具、夹具等，确认无误后方可进行。

答案：正确

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不定项选择

Gamma为负的Delta中性投资组合的持有者，喜欢标的资产大幅波动。

A．正确
B．错误

单项选择题

Changes in the social structure may indirectly _____ juvenile crime rates. … Families have also experienced changes these years. This lack of parental supervision is thought to be an influence on juvenile crime rates.

A．affect
B．reduce
C．check
D．reflect