膀胱手术后病人的导尿管应
A．立即拔出B．手术后24小时拔出C．继续留置D．由病情决定E．以上均不对
参考答案：C
-Were they young then?
-__________________ [ ]
A. Yes, they weren't.
B. N0, they were.
C. Yes, they were.
把一个正方体用刀切去一块，能否还得到正方体？长方体、三棱柱、三棱锥、四棱柱、五棱柱呢？
