绞窄性小肠梗阻常见原因()
A.扭转
B.内疝
C.套叠
D.粘连
E.以上都不是
参考答案:A, B, C, D
解析:绞窄性肠梗阻常见的原因是小肠扭转、粘连带压迫、内疝、套叠等。
He________ go far if he ________some help. We live near him.
A.doesn't need, needs
B.doesn't have to, needs
C.has not to, needs
D.not has to, need
从Windows环境进入MS―DOS方式后,返回Windows环境的DOS命令为( )。
A.EXIT
B.QUIT
C.RET
D.MSDOS