关于胎膜早破，下列描述正确的是（）。 A.胎膜早破发生于临产前 B.应积极预防脐带脱

A、B、C、D、E代表5种元素。请填空：

1）A元素基态原子的最外层有3个未成对电子，次外层有2个电子，其原子核外电子的运动状态有    种。

2）B元素的负一价离子和C元素的正一价离子的电子层结构都与氩相同，

B原子的价电子排布图为      ，C元素的原子结构示意图为     。

3）D元素的正三价离子的3d亚层为半充满，D的元素符号为    ，其基态原子的价电子排布式为      。

4）E元素基态原子的M层全充满，N层没有成对电子，只有一个未成对电子，E的元素符号为    ，其基态原子的电子排布式为     。

填空(共10小题；每小题1分，满分10分)

阅读下面短文，根据所读内容在文后第76至第85小题的空格中填上适当的单词或短语。

注意：每空不超过3个单词。

Host family accommodation,or living with host families,remains popular among language travel students for its unique advantages.These days,host families are trying to offer more in terms of quality,for they still have something to worry about.

Host family accommodation is often seen as the number-one choice for its advantages in language study,cultural communication and cost of living.Staying alongside host families enables students to get enough practice for the short time of their studying so that their language acquisiton is likely to become faster.Living in host families also has the advantage of students of being able to spend a lot of time communicating with their “host parents”,and get to know the local way of life,people and culture.Another advantage is that host family accommodation can sometimes be the least expensive.It attracts students for it ensures them a family type of living at a low cost.

The advantages,however,have not prevented host families from worrying.On one hand,some host families are losing their unique selling point.The probelm is that the majority of bosts in big cities,now generally single and young,have less time available for students,but the selling point for host family accommodation is communication practice.On the other,students’ expectations have risen.They are becoming more demanding and asking for more than ever from their accommodation,as they come mainly from high socio-economic groups in their own countries.

To get out of the difficult situation,host families are now making efforts to improve the quality of service.They are trying to make living conditions better,including broadband Internet service,private bathroom,and access to plenty of hot water for long showers.They are also providing students with structured family activities.

It is believed that host family accommodation will keep the popularity vote with language travel students.

综采工作面（机电）安全质量标准化检查中，电气设备防爆合格率是（）％

A、95

B、90

C、100

D、85

（）参与本地网范围内CN2设备的工程随工和工程验收。

A.各省NOC

B.地市NOC

C.集团上海NOC

D.集团北京NOC

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