如图所示,不计质量的光滑小滑轮用细绳悬挂于墙上O点,跨过滑轮的细绳连接物块A、B

题型:多选题

问题:

如图所示,不计质量的光滑小滑轮用细绳悬挂于墙上O点,跨过滑轮的细绳连接物块A、B,A、B都处于静止状态,现将物块B移至C点后,A、B仍保持静止,下列说法中正确的是(  )

A.B与水平面间的摩擦力增大

B.拉B的绳子的拉力增大

C.悬于墙上的绳所受拉力不变

D.A、B静止时,图中α、β、θ三角始终相等

考点:共点力的平衡滑动摩擦力、动摩擦因数力的合成
题型:多选题

阅读理解。

     Australia has an unusual kangaroo-although he is a pet, he lives like a man. He is dressed in clothes,

likes watching TV and drinking, also eats bread, plays football and does some exercise.

     His name is Bi Muer. Months ago, a 50-year-old woman, Julia Bradley adopted (收养) him. He now lives

a happy life. Every morning, he can enjoy delicious bread and later watch TV with his "mom". In the afternoon,

he can go to the garden and play football and in the evening, he can drink while watching TV.

    In the beginning, Muer was only 20cm tall, but now, he can easily jump over a one-meter fence.

1. The kangaroo likes __________.

A. watching TV and drinking

B. seeing a movie

C. playing basketball

2. Who adopted the kangaroo?

A. Bi Muer.

B. Julia Bradly.

C. Bill Smith.

3. What can the kangaroo do every morning?

A. Drink.

B. Go to the garden.

C. Enjoy delicious bread and watch TV.

4. How tall was the kangaroo in the beginning?

A. 10cm.

B. 20cm.

C. 30cm.

5. The passage is mainly about __________.

A. An unusual kangaroo

B. An Australia woman

C. A kangaroo's hobbies

题型:多选题

下列关于人身权的表述正确的是()

A.可与人身分离

B.具有财产内容

C.与财产权具有密切联系

D.具有相对性

题型:多选题

下列关于国家对矿山企业安全管理的基本要求的说法中,正确的有()

A.未经安全教育、培训的,不得上岗作业

B.矿长必须经过考核,具备安全专业知识

C.矿山企业一般不分配女职工从事矿山井下劳动

D.矿山企业必须制定矿山事故防范措施,并组织落实

E.劳动行政主管部门的矿山安全监督人员有权进入矿山企业现场检查安全状况

题型:多选题

依我国明清时期的科举制度,其各级考试由低到高排列,应当是

A.乡试,会试,院试,殿试

B.院试,会试,乡试,殿试

C.院试,乡试,会试,殿试

D.乡试,院试,会试,殿试

题型:多选题

公共生活中的道德和()所追求的目标是一致的,都是通过规范人们的行为来维护公共生活中的秩序,实现社会稳定和经济发展。

A.纪律

B.政策

C.法律

D.守则

更多题库