如图所示,一长木块被固定在水平面上,质量相同的子弹A、B从木块两侧同时水平相向地

题型:多选题

问题:

如图所示,一长木块被固定在水平面上,质量相同的子弹A、B从木块两侧同时水平相向地射入木块,最终都停在木块中,子弹A的射入深度dA大于子弹B的深度dB,假设子弹A、B在运动过程中所受阻力大小恒定且相同,则可判断(  )

A.子弹在木块中运动时间长短关系为tA>tB

B.子弹射入初动能大小关系为EkA>EkB

C.子弹入射初速度大小关系为vA>vB

D.子弹对木块的作用力做功多少关系为WA>WB

考点:动能定理动量守恒定律
题型:多选题

某社区医院口腔科准备在某日利用半天的时间进行一次关于正确刷牙方法的普及活动,以使所在社区居民了解并掌握"上牙从上往下刷,下牙从下往上刷,磨牙面上来回刷,里里外外都要刷"的科学刷牙方法,养成良好的刷牙习惯。

在此次健康传播活动中,社区医院的医护人员是()

A.传播者

B.受传者

C.既是传播者又是受传者

D.信息的载体

E.信息本身

题型:多选题

含氢氯噻嗪的中成药是()

A.冠通片考试用书

B.心血宝胶囊

C.脉络通颗粒

D.珍菊降压片

E.强力康颗粒

题型:多选题

Violin prodigies(神童), I learned, have come in distinct waves from distinct regions. Most of the great performers of the late 19th and early 20th centuries were born and brought up in Russia and Eastern Europe. I asked Isaac Stern, one of the world’s greatest violinists, the reason for this phenomenon. “It’s very clear, “he told me. “They were all Jews and Jews at the time were severely oppressed and ill-treated in that part of the world. They were not allowed into the professional fields, but they were allowed to achieve excellence on a concert stage.” As a result, every Jewish parent’s dream was to have a child in the music school because it was a passport to the West.

Another element in the emergence of prodigies, I found, is a society that values excellence in a certain field and is able to nurture (培育) talent. Nowadays the most nurturing societies seem to be in the Far East. “In Japan, a most competitive society with stronger discipline than ours,” says Isaac Stern, “children are ready to test their limits every day in many fields, including music. When Western music came to Japan after World War II, that music not only became part of their daily lives, but it became a discipline as well.” The Koreans and Chinese, as we know, are just as highly motivated as the Japanese.

That’s a good thing, because even prodigies must work hard. Next to hard work, biological inheritance plays an important role in the making of a prodigy. J. S. Bach, for example, was the top of several generations of musicians, and four of his sons had significant careers in music.

小题1:Jewish parents in Eastern Europe longed for their children to attend music school because ______.   

A.it would allow them access to a better life in the West

B.Jewish children are born with excellent musical talent

C.they wanted their children to enter into the professional fields

D.it would enable the family to get better treatment in their own country小题2: Nurturing societies as mentioned in the passage refer to societies that ______.

A.enforce strong discipline on students who want to achieve excellence

B.treasure talent and provide opportunities for its full development

C.encourage people to compete with each other

D.promise talented children high positions小题3:Japan is described in the passage as a country that attaches importance to ______.

A.all-rounded development

B.the learning of Western music

C.strict training of children

D.variety in academic studies小题4:Which of the following contributes to the emergence of musical prodigies according to the passage?

A.A natural gift.

B.Extensive knowledge of music.

C.Very early training.

D.A prejudice-free society.

题型:多选题

B型超声确定排卵的声像特征为:①________;②________;③________;④________。

题型:多选题

下列哪项表现不属于Ⅱ期乳腺癌()

A.癌瘤尚能推动

B.同侧腋窝淋巴结有转移

C.有橘皮样改变

D.癌瘤直径不超过3cm

E.锁骨上淋巴结转移

更多题库