如图所示,小球A和B的质量均为m,长度相同的四根细线分别连接在两球间、球与水平天

题型:选择题

问题:

如图所示,小球A和B的质量均为m,长度相同的四根细线分别连接在两球间、球与水平天花板上P点以及与竖直墙上的Q点之间,它们均被拉直,且P、B间细线恰好处于竖直方向,两小球均处于静止状态,则Q、A间水平细线对球的拉力大小为(  )

A.

2
2mg

B.mg

C.

3
mg

D.

3
3mg

考点:共点力的平衡
题型:选择题

妊娠期比非孕期肾小球滤过率约增加()

A.10%

B.30%

C.40%~45%

D.35%

E.50%

题型:选择题

确定良性与恶性肿瘤主要的组织学依据是()。

A.生长方式

B.肿瘤的异型性

C.生长速度

D.对机体影响

E.出血与坏死

题型:选择题

个别交谈()

A.口腔专业人员就口腔健康问题与预防保健问题与患者、领导、家长、居委会成员、保健人员进行交谈、讨论的方法

B.社区座谈会、专家研讨会、专题讨论会、听取群众意见会等传播口腔健康信息和调查研究

C.通过报纸、杂志、电视、电影、广播、街头展播与宣传橱窗等传播口腔健康信息

D.为改善环境使之适合于保护口腔健康或使行为有利于口腔健康所采取的各种干预措施

E.城市街道、农村乡镇及社会团体与单位的有组织的活动,旨在使人们提高对口腔健康的认识,引起兴趣,产生强烈的口腔健康愿望

题型:选择题

经以下途径给药时,所需剂量最大的是

A、舌下 

B、皮肤 

C、肛门 

D、静脉 

E、口服

题型:选择题

Recently, one of my best friends, whom I’ve shared just about everything with since the first day of kindergarten, spent the weekend with me. Since I moved to a new town several years ago, we’ve both always looked forward to the few times a year when we can see each other.

Over the weekend, we spent hours and hours, staying up late into the night, talking about the people she was hanging around with. She started telling me stories about her new boyfriend, about how he experimented with drugs and was into other self-destructive behavior. I was blown away! She told me how she had been lying to her parents about where she was going and even stealing out to see this guy because they didn’t want her around him. No matter how hard I tried to tell her that she deserved better, she didn’t believe me. Her self-respect seemed to have disappeared.

I tried to convince her that she was ruining her future and heading for big trouble. I felt like I was getting nowhere. I just couldn’t believe that she really thought it was acceptable to hang with a bunch of losers, especially her boyfriend.

By the time she left, I was really worried about her and exhausted by the experience. It had been so frustrating, I had come close to telling her several times during the weekend that maybe we had just grown too far apart to continue our friendship,but I didn’t. I put the power of friendship to the final test. We’d been friends for far too long. I had to hope that she valued me enough to know that I was trying to save her from hurting herself. I wanted to believe that our friendship could conquer anything.

A few days later, she called to say that she had thought long and hard about our conversation, and then she told me that she had broken up with her boyfriend. I just listened on the other end of the phone with tears of joy running down my face. It was one of the truly rewarding moments in my life. Never had I been so proud of a friend.

56. In the writer’s opinion, her friend ________.

A. was a girl with no self-respect

B. could find a better boyfriend

C. was brave enough to stick to her own choice

D. didn’t value the writer’s suggestion

57. What did the writer worry about?

A. She would lose the friendship with her.

B. Her friend’s parents would be worried about their daughter.

C. Her friend would get into great trouble with the boy.

D. Her friend’s boyfriend would be in great trouble.

58. We may leam from Paragraph 3 that the writer ________.

A. didn’t want to go anywhere else

B. hated her friend’s hanging with her boyfriend

C. couldn’t believe that her friend’s choice was acceptable

D. doubted that she could in any way help her friend

59. What can be concluded from the passage?

A. Friendship starting from childhood is not reliable.

B. Friendship is a cure for any injury in life.

C. Friendship should be everlasting once begun.

D. Friendship can have magical power in life.

更多题库