膝下截肢时膝关节挛缩是（）
A.不可避免
B.继发于腘绳肌与股四头肌的不平衡
C.最常见于膝伸展
D.因不适当体位造成
E.成人较儿童少见
参考答案：D
4．The couple as well as all their family members were informed of the details on Sunday morning, _________a meeting was held.
A．in which
B．after that
C．from which
D．after which
以下叙述中错误的是
A．计算机不能直接执行用C语言编写的源程序
B．C程序经C编译程序编译后，生成后缀为.obj的文件是一个二进制文件
C．后缀为.obj的文件，经连接程序生成后缀为.exe的文件是一个二进制文件
D．后缀为.obj和.exe的二进制文件都可以直接运行
