如图所示,一根杠杆可以绕O点转动,在D点挂一重物G,在C点加一水平向右的力F,其

题型:选择题

问题:

如图所示,一根杠杆可以绕O点转动,在D点挂一重物G,在C点加一水平向右的力F,其力臂是

[ ]

A、OA

B、OC

C、AC

D、OB

考点:杠杆的平衡条件
题型:选择题

细菌的生长繁殖方式为

A.有丝分裂

B.二分裂

C.复制

D.裂解

E.孵化

题型:选择题

光面爆破时,应尽可能减少周边眼间的起爆时差,相邻光面炮眼的起爆间隔时问不应大于()。

A.200ms

B.150ms

C.100ms

题型:选择题

Perhaps the most famous theory, the study of body movement, was suggested by Professor Ray Birdwhistell. He believes that physical appearance is often culturally programmed. In other words, we learn our looks—we are not born with them. A baby has generally informed face features. A baby, according to Birdwhistell, learns where to set the eyebrows by looking at those around-family and friends. This helps explain why the people of some areas of the United States look so much alike, new Englanders or Southerners have certain common face features that cannot be explained by genetics(遗传学). The exact shape of the mouth is not set at birth, it is learned after. In fact, the final mouth shape is not formed until well after new teeth are set. For many, this can be well into grown-ups. A husband and wife together for a long time often come to look alike. We learn our looks from those around us. This is perhaps why in a single country area where people smile more than those in other areas. In the United States, for example, the South is the part of the country where the people smile most frequently. In New England they smile less, and in the western part of New York State still less. Many southerners find cities such as New York cold and unfriendly, partly because people on Madison Avenue smile less than people on Peachtree Street in Atlanta. Georgia. People in Atlanta, Georgia. People in largely populated areas also smile and greet each other in public less than people in small towns do.

小题1:Ray Birdwhistell believes that physical appearance _______.

A.has little to do with culture

B.has much to do with culture

C.is ever changing

D.is different from place to place小题2:According to the passage, the final mouth shape is formed _______.

A.before birth

B.as soon as one’s teeth are newly set

C.sometime after new teeth are set

D.around 15 years old小题3:Ray Birdwhistell can tell what area of the United States a person is from by _______.

A.how much he or she laughs

B.how he or she raises his or her eyebrows

C.what he or she likes best

D.the way he or she talks小题4:This passage might have been taken out of a book dealing with ________.

A.physics

B.chemistry

C.biology

D.none of the above

题型:选择题

土地估价就是估价人员( )评定出某块土地或多块土地在某一权利状态下某一时点的价格的过程。

A.客观

B.实际

C.正确

D.综合

题型:选择题

对金融机构当期实际收到的结算罚款、罚息、加息、出纳长款等收入,应并入营业额中征收营业税。( )

更多题库