如图所示,跟水平面成37°角且连接电源的光滑金属框架宽为20cm,一根重为G的金

题型:问答题

问题:

如图所示,跟水平面成37°角且连接电源的光滑金属框架宽为20cm,一根重为G的金属棒ab水平放在金属框架,磁感应强度B=0.6T,方向垂直斜面向上,当通过金属棒的电流为5A时,它刚好处于静止状态,试求:

(1)金属棒的重力G的大小

(2)电流方向?

考点:共点力的平衡磁场对通电导线的作用:安培力、左手定则
题型:问答题

①A new Long March(长征)

Twenty-one people from Hong Kong and the Chinese mainland began a new Long March on October 15. They will walk about 8,000 kilometres from Ruijin, Jiangxi to Wuqi, Shanxi. They hope to get 20.2 million yuan to build 101 schools and help poor children go back to school. They hope to finish the march by August 16, 2012.

②The football team

The Chinese under-17 football team is No. 1 in Asia. They won the Asian U-17 Championship(亚洲U-17锦标赛)in Japan on Saturday. They beat the Democratic People’s Republic of Korea(朝鲜)by 1:0. After 85 minutes, Wang Weilong got the only goal. They took the cup for the first time in 12 years.

③Liu leaves China

Chinese actor Liu Ye left for the US on Monday to make a film called Meteor(《流星》). He is going to act with the Hollywood film star Meryl Streep. His former classmate Zhang Ziyi sent Liu a message to encourage him. Liu was worried about his English, and worked hard on it before he left. People know him from films like last year’s “Mei Ren Cao”。

小题1:From the news,we know that the twenty-one people began a new Long March to ______.

A.travel around China

B.visit some schools

C.teach poor children

D.get some money and help poor children go back to school小题2:The second piece of news tells us ______.

A.Korea held this contest

B.the Chinese football team is No. 1 in South-East Asia

C.the Chinese under-17 football team won the world championship

D.the Chinese under-17 football team won the championship for the first time in 12years小题3:Which of the paragraphs is about film stars? ______

A.The 1st

B.The 2nd

C.The 3rd

D.The 3rd and the 1st

题型:问答题

生物调节器原设计者认为()。

A.Ⅰ类错是由于舌功能比颊功能弱,因而牙弓宽度发育不足,牙列拥挤

B.Ⅱ类错是舌位置靠后的结果

C.Ⅲ类错是舌位置靠前的结果

D.唇的封闭是生长潜力自由发展的前提,唇功能异常,生长将受阻

E.以上均正确

题型:问答题

女性,23岁,月经增多8个月,2周来牙龈出血,下肢皮肤散在出血点及瘀斑,血红蛋白78g/L,白细胞5.0×109/L,血小板计数48×109/L。临床诊断为特发性血小板减少性紫癜

首选治疗为()

A.输血小板浓缩液

B.抗纤溶药物

C.免疫抑制剂

D.肾上腺皮质激素

E.脾切除

题型:问答题

战略管理中最困难的一环是()。

A.战略制定

B.战略实施

C.战略分析

D.战略调整

题型:问答题

被誉为“咫尺之内再造乾坤”的苏州园林,其设计源自江南风景中的曲径流水、雕窗匾额、楹联书画……置身于其中,“风载书声出藕花”的江南情思油然而生。材料蕴含的哲理是()

A.意识能够能动地改造客观世界

B.意识是沟通主客观世界的桥梁

C.意识是客观事物在人脑中的反映

D.意识对人的生理活动具有调节作用

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