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问题 选择题
孤立的A、B两点电荷相距R，A的电量是B的a倍，A的质量是B的b倍，已知A受到的静电力大小为F，则B受到的静电力大小为（   ）

A．F

B．(a+b)F

C．(a-b)F

D．abF

答案

答案：A

单项选择题

Originally introduced by Netscape Communications, (1)are a general mechanism which HTTP Server side applications, such as CGI (2) ,can use to both store and retrieve information on the HTTP(3)side of the connection. Basically, Cookies can be used to compensate for the (4) nature of HTTP. The addition of a simple, persistent, client-side state significantly extends the capabilities of WWW-based (5) .

空白（5）处应选择（）

A.programs

B.applications

C.frameworks

D.constrains
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单项选择题 A3/A4型题

患者，男，40岁，外伤致胫骨平台骨折（Ⅱ型），手术切开复位，螺钉内固定，石膏托外固定，术后第二周。

为防止肌肉失用性萎缩，训练股四头肌时选用（）

A.等速向心性运动练习

B.等速离心性运动练习

C.等张运动练习

D.等长运动练习

E.等动运动练习
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