对胎儿威胁最大的分娩期的并发症是
A.羊水栓塞B.难产C.胎膜早破D.子宫破裂E.脐带脱垂
参考答案:E
阅读短文,回答下列问题。
We have a new house in Beijing. We live in Flat (公寓) 4A. Miss Li lives next to us. She lives in Flat 4B.
She lives with her parents and two brothers. There are three bedrooms in Miss Li's flat.
Miss Li loves little animals. She keeps a cat and three fish. She wants to keep a dog, too. But her mother
doesn't like dogs. Miss Li is kind to her pets (宠物). Every day she gives nice food to them.
1. How many people are there in Flat 4B?
2. What does Miss Li love?
3. How many pets does Miss Li have?
4. Who doesn't like dogs?
5. Is Miss Li kind to her pets?
电力系统交流电的波形应是()。
A.余弦波
B.正切波
C.正弦波
D.余切波