19世纪50——70年代，俄国和日本的相似之处不包括[ ] A．面临严重的统治危

对初戴全口义齿患者、不正确的说法是()

A．戴牙后即可正常进食

B．让患者带食物在椅旁试用

C．戴牙后发音立即恢复正常

D．不宜过早戴义齿进食

E．先吃软小食物、不用前牙咬碎食物

阅读短文,回答后面的问题。

     John is a student. He usually goes to school on foot. This morning he went to school by bus because

he got up late. Mike is John's classmate and he didn't go to school. He went swimming yesterday and

had a cold. The doctor asked him to take some medicine and stay in bed. So he has to stay at home for

a few days. After school, John and his classmates are going to buy some flowers and visit him.   

Please answer the questions:    

1. What is John?

    ___________________________________________________

2. How did John go to school this morning?

    ___________________________________________________

3. Did Mike have a cold?

    ___________________________________________________

4. What did Mike do yesterday?

    ___________________________________________________

5. What is John going to do after school?

    ___________________________________________________

如图所示，用水平力F将一木块压在竖直墙壁上，已知木块重力G=6N，木块与墙壁间的动摩擦因数μ=0.25，问：

（1）当F=25N时，木块没有启动，木块受到的摩擦力为多大？

（2）当F增大为30N时，木块仍静止，木块受到的摩擦力为多大？

（3）当F=10N时，木块沿墙面下滑，此时木块受到的摩擦力为多大？

（4）当F=6N时，木块受到的摩擦力又为多大？

带电作业的（）应由具备带电作业资格、具有带电作业实践经验的人员担任。

A、工作人员

B、工作负责人

C、工作票签发人

D、专责监护人

E、工作许可人

肺炎链球菌肺炎患者，出现心悸、气短，查体见心脏增大、奔马律、心脏收缩期杂音。应考虑出现的并发症是（）

A.感染性休克

B.脓胸

C.心肌炎

D.胸膜炎

E.心包炎