题目内容
胎膜未破，胎动、宫缩后胎心突然减慢，改变体位后迅速恢复，考虑可能存在：
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上述哪种病有三个基本特点：严重的细胞免疫缺陷；发生各种致命的机会感染；发生各种恶性肿瘤
内伤所致疮疡常见的病因：
I live in a big city. It's noisy and dirty and I get very 【C1】______ . At the weekends I like to leave the city and get some 【C2】______ air and a good rest. A few weeks ago I decided to go to see my 【C3】______ . I was really looking forward to it.
My parents live a long way 【C4】______ . I went to see them with James, a friend, and we drove on Friday night. In the middle of the 【C5】______ it began to rain. The road became very 【C6】______ and it was difficult to drive. We arrived home just after midnight, feeling very 【C7】______ .The next 【C8】______ it was still raining. James took his 【C9】______ to a garage which was very good.
In the afternoon the 【C10】______ improved, we wanted to go for a 【C11】______ . My parents lent us their car. That was no good. Their car didn't 【C12】______ . We rang up the garage. "Oh," they said, "your car 【C13】______ be ready till tomorrow. " So it wasn't 【C14】______ to go for a drive. We decided to play a word game. When we didn't agree 【C15】______ a word we looked for a dictionary. It wasn't there. 【C16】______ my mother remembered, "I lent it to your sister. She took it with her when she left. " The word game wasn't any good 【C17】______ a dictionary.
On Sunday my mother dropped a heavy box on her 【C18】______ and we had to hire a 【C19】______ to take her to hospital.
When James and I drove back we got stuck in a car accident. If I want a rest next time, I'll stay in the 【C20】______ .
【C1】______
他励直流电动机改变励磁时特性曲线也随之变化，如下图所示为1台直流电动机在磁通分别为ΦN、Φ1、Φ2三种情况下的特性曲线。ΦN、Φ1、Φ2的大小关系式为()。
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