更多"The mechanical energy can be change"的相关试题:
[单项选择]We can conclude from the passage that using an electric car can ______.
A. save more money than using the regular cars in every way
B. prevent pollution and save energy in the long run
C. attract more customers to buy VSPs
D. soon lead to eliminating traditional cars
[单项选择]The energy gained-from the sun can then be used during the night to enable the necessary chemical reactions to ______ in his body.
A. precede
B. proceed
C. progress
D. practice
[单项选择]Mike can take his car apart and put it back together again. I certainly wish he ______ me how.
A. teaches
B. will teach
C. has taught
D. would teach
[单项选择]Machines that use hydraulic pressure including elevators, dentist chairs, and automobile brakes.
A. exclude
B. excluding
C. include
D. are included
[单项选择]You can go out, ______you promise to be back before 11 o'clock.
A. even though
B. ever since
C. as far as
D. as long is
[单选题]题目 92
--How can we live a greener life? --We should save ( )energy and reduce pollution.
A. no
B. less
C. more
D. most
[单项选择]Electrical energy may be divided into two components ______ as positive and negative.
A. distinguished
B. specified
C. separated
D. indicated
[单项选择]Every chemical change either results from energy being used to produce the change, or causes energy to be ______ in some form.
A. given off
B. put out
C. set off .
D. used up
[单项选择]From the sentence "Energy Secretary Bill Richardson, whose department had ignored security at Los Alamos for years, was walking around in a daze. ", we know that_____.
A. Energy Secretary Bill Richardson was chiefly responsible for the case
B. Energy Secretary Bill Richardson was in a great angry
C. Energy Secretary Bill Richardson was losing his mind in dealing with the case
D. Energy Secretary Bill Richardson was defeated severely
[单项选择]Why are subterranean buildings good for energy conservation
[单项选择]
Passage 5
The energy which the sun radiates goes in every direction, and only a minute part of it falls on the earth. Even so, it represents power of about 5,000,000 horsepower (马力)per square mile per day; the sun gives us as much energy every minute as mankind utilizes in a year. At present, we use this energy in directly, and it is our final source of power. Coal represents the chemical action of the sun on green plants thousands of years ago. Water power results from the rain formed by vapor which comes from the evaporation of power. Coal represents the rain formed by vapor which comes from the evaporation of water under the sunshine. Even windmills operate because of air currents set in motion by the different heating affects of the sun in different places. Some day, through chemistry or some type of solar engine, we shall harness this great source of energy more directly. Already a scientist has worked out an engine, surprisingly efficient, in with the sun&rsq
A. only a very small part is available
B. the sun is too distant from the earth
C. it takes thousands of years for this energy to be stored up in coal and oil
D. our scientific knowledge is not sufficient
