下列哪项不属于早产原因的胎儿因素
A．宫内感染B．双胎妊娠C．胎膜早破D．羊水过多E．羊水过少
参考答案：E
----- Can I go back home now? ----- You______ to leave until you ______ your work.
A．won’t allow; finish
B．won’t be allowed; will finish
C．won’t be allowed; have finished
D．won’t allow; will finish
为什么要设立导向轮装置？
