数据通信中曼彻斯特编码的波形如下图所示： 　　请指出它所表示的二进制比特序列的值是

老年退行性心脏瓣膜病的独立危险因素是（）

A.年龄

B.性别

C.吸烟

D.高血压

E.超重、高脂血症及糖尿病

下列关于我国证券交易所会员的说法，正确的有( )。

A．证券交易所会员应具有法人资格

B．证券交易所会员要经过地方证管办批准才能设立

C．证券交易所会员依法可从事证券交易及相关业务

D．证券交易所会员是取得证券交易所会籍的证券公司

一本书放在水平桌面上，下列说法中正确的是（　　）

A．书的重力就是书对桌面的压力

B．书对桌面的压力与桌面对书的支持力是一对平衡力

C．书的重力与桌面对书的支持力是一对平衡力

D．书对桌面的压力性质属于弹力

质量分别为40kg和50kg的甲、乙两个小孩，都穿着冰鞋在溜冰场的冰面上，若甲小孩用20N的水平力推开乙小孩，则甲小孩的加速度为______m/s²，乙小孩的加速度为______m/s²．

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.