搜题请搜索小程序“爱下问搜题”
问题 单项选择题

临床定义胚胎已在宫内死亡，但未自然排出的情况为（）

A.感染性流产

B.难免流产

C.早产

D.稽留流产

E.完全流产

答案

参考答案：D

解析：稽留流产指胚胎或胎儿已死亡滞留在宫腔内尚未自然排出者。

完形填空

One evening I was resting in a cafe. I wore a pair of newly bought white leather shoes,    小题1:    were rather expensive. Then a boy came to me.

He was in 小题2:  old and not fit shirt, looking pale and about eleven. No sooner had I begun to speak than he opened the box in his hand and  小题3:  (take) out the tools of shoe-polishing. He was busy doing his work    小题4:   heavy rain began to pour down. People rushed to the café for protection from the rain. More and more people crowded in and gradually separated the boy from me.

Hours passed, and    小题5:   turned dark. I had no shoes on my feet and wondered where the boy had been. I thought I would have to go home on my bare feet. When it was near midnight, the café was to be closed. I had to move to the door, just as I went to the gate, I   小题6:      (surprise) found that a boy of about eleven,        小题7:      (look) very familiar, was sleeping at the door with his head leaning      小题8:   a box. I shook him slightly and woke him up. He opened the package hurriedly, gave me my leather shoes, and apologized to me shyly. I paid him and wrapped him with his     小题9:     (fit) shirt. On my way home, the image    小题10:  the boy stayed in my mind.
查看答案
问答题

设f(x)在[0，1]上可导，且

，试证：
(Ⅰ) 在(0，1)内至少有一点ξ，使

；
(Ⅱ) 在(0，1)内至少有一点η，使2f(η)+ηf’(η)=0．
查看答案