一质量为1kg的物体被人用手由静止向上提升1m,物体的速度达到2m/s,g取10

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问题:

一质量为1kg的物体被人用手由静止向上提升1m,物体的速度达到2m/s,g取10m/s2.下列说法正确的是(  )

A.提升过程中手对物体做功10J

B.提升过程中合外力对物体做功2J

C.提升过程中合外力对物体做功12J

D.提升过程中物体克服重力做功10J

考点:动能定理
题型:多选题

      Martin Lynch, an American businessman, had been going on vacation to a small Mexican fishing village for a number of ears. One morning while going for a walk along the beach, he saw his friend Pablo Perez, a local fisherman. Martin watched Pablo unload his boat and pack the fish in a box.

      Martin noticed Pablo was smiling and looked very happy. He could also see several large fish in the boat. Martin greeted Pablo and asked how long it took to catch the fish. “Just a few hours,” replied Pablo. Martin asked, “Why didn’t you stay longer and catch more fish?” “I have enough for my family,” Pablo said. “And what do you do with the rest of your day?” asked Martin. “I take a nap, play with my children, spend time with my wife, and go into the village to see my friends and play cards, I have a full and busy life.”    

      Martin explained that if Pablo worked longer hours and caught more fish, he could make more money. With the extra money, Pablo could buy more boats and catch money more fish. By selling the fish, Pablo could open his own factory and sell direct to supermarkets.

       “Then what?” asked Pablo. “Well you would probably have to move to Mexico City to run the business. Finally, you would be able to sell your business and make millions of dollars,” replied Martin. “How long will that take?” asked Pablo.

       Martin thought for a while and said it would probably take at least 15 years.

      “And then what” asked Pablo.

       “Well, that’s the best part,” Martin said. “You will be able to retire, buy a house near the ocean, sleep longer, play with your children, spend more time with your wife, see your friends, and play cards.”

66. What is the story mainly about? [ ]

A. A businessman and a fisherman have become friends.

B. A businessman learns how to fish from a fisherman.

C. A businessman wants to become a businessman.

D. A businessman gives advice to a fisherman.

67. What makes the Mexican fisherman happy is ______________. [ ]

A. many friends to visit him

B. a full and busy life

C. more boats and more fish

D. the house near the ocean

68. How can the fisherman make more money in the businessman’s view? [ ]

A. By buying a supermarket.

B. To move to Mexico City.

C. By selling his own business.

D. To work longer and catch more fish.

69. The underlined word “unload” in the passage means ____________.  [ ]

A. put … into               

B. take … away from 

C. break down               

D. set off 

70. We can infer from the passage that ____________.  [ ]

A. the fisherman will stay the same with his life 

B. the fisherman will leave the village for Mexico City 

C. the business man will buy the fisherman’s boat 

D. it takes all day for the fisherman to catch large fish 

题型:多选题

长沙市某楼盘准备以每平方米5000元的均价对外销售,由于国务院有关房地产的新政策出台后,购房者持币观望,为了加快资金周转,房地产开发商对价格经过两次下调后,决定以每平方米4050元的均价开盘销售。

(1)求平均每次下调的百分率;

(2)某人准备以开盘均价购买一套100平方米的房子,开发商还给予以下两种优惠方案以供选择:①打9.8折销售;②不打折,送两年物业管理费,物业管理费是每平方米每月1.5元,请问哪种方案更优惠?

题型:多选题

手阳明大肠经在前臂的循行部位是()

A.内侧前缘

B.内侧两筋之间

C.外侧前缘

D.手少阳和手太阳两经之间

E.手少阳和手太阳经之后

题型:多选题

男,35岁,突然昏迷不醒。CT示右侧侧裂池、颞角呈铸形高密度。最可能的诊断为()

A.右基底动脉瘤破裂出血

B.右侧大脑前动脉瘤破裂出血

C.右侧大脑中动脉瘤破裂出血

D.右侧大脑后动脉瘤破裂出血

E.前交通动脉瘤破裂出血

题型:多选题

( )的质量监理是设备质量监理的核心内容。

A.设计过程

B.采购过程

C.制造过程

D.安装调试过程

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