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问题 不定项选择

水平方向做简谐运动的弹簧振子，其质量为m，最大速率为v，则下列说法中正确的是[ ]

A．振动系统的最大弹性势能为mv2

B．当振子的速率减为时，此振动系统的弹性势能为

C．从某时刻起，在半个周期内，弹力做的功可能不为零

D．从某时刻起，在半个周期内，弹力做的功一定为mv2

答案

A

单项选择题

在下列方中柴胡的功效不涉及疏肝解郁的是

A．普济消毒饮
B．血府逐瘀汤
C．龙胆泻肝汤
D．四逆散
E．小柴胡汤
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问答题

While attractiveness is a positive factor for a man on his way up the executive ladder, it is harmful to woman.
Handsome male executives were perceived as having more integrity than plainer men; effort and ability were thought to account for their success.
Attractive female executives were considered to have less integrity than unattractive ones; their success was attributed not to ability but to factors such as luck.
All unattractive women executives were thought to have more integrity and to be more capable than the attractive female executives. Interestingly, though, the rise of the unattraetive overnight successes was attributed more to personal relationships and less to ability than was that of attractive overnight successes.
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