关于病理性缩复环,下述错误的是()。
A.多发生于头盆不称,忽略性横位
B.环之上宫体有压痛
C.常伴有血尿
D.是先兆子宫破裂的征象
E.立即剖宫产
参考答案:B
Tom was about to close the window _____ his attention was caught by a bird. [ ]
A. when
B. if
C. and
D. till
机泵备用泵定期盘车能润滑轴承。