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【单选题】
关于机械效率的问题，下列说法中正确的是 [ ]A.
机械越省力，机械效率一定越高
B.
做功越多，机械效率一定越高
C.
无论何种机械，机械效率一定小于1
D.
单位时间内做功越多，机械效率一定越高
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举一反三
【单选题】According to the third paragraph, which of the following is NOT a perceived advantage of alliances?
A.
Baggage allowance.
B.
Passenger Comfort.
C.
Convenience.
D.
Quality.
【单选题】测定铅时,以什么为指示剂,什么为缓冲溶液,调节pH到多少?
A.
XO，硝酸，1
B.
XO，六亚甲基四胺，5-6
C.
XO，醋酸-醋酸钠，5-6
D.
XO，氨-氯化铵，10
【简答题】His interests in something very different A. The quality of meat and the amount of meat that is put into foods like sausages and hamburgers. B. In 1968, _____ were passed because of Nader’s efforts. a...
【单选题】Over the years, jazz has changed and developed, but it has retained or kept its basic quality. One of the forms of music that contributed to the development of jazz was the blues. About a third of jaz...
A.
It is the second most popular music.
B.
It is only half lively as jazz.
C.
It is the least developed of all musical forms.
D.
It is often written in blues form.
【单选题】Over the years, jazz has changed and developed, but it has retained or kept its basic quality. One of the forms of music that contributed to the development of jazz was the blues. About a third of jaz...
A.
To trace the musical origins of jazz.
B.
To distinguish between classical and popular music.
C.
To change the composition of jazz music.
D.
To cite examples of regional music.
【单选题】The third quality of da Vinci's character that informs our work at MIT is an enthusiastic demand for , designing, practicing, and testing, and for solving problems in the real world. His fascina...
A.
The third quality of da Vinci's character that informs our work at MIT is an enthusiastic demand for , designing, practicing, and testing, and for solving problems in the real world.
B.
His fascination for tackling practical problems resembles the central mission of MIT.
C.
Da Vinci taught his students to learn by doing in the same way that will define your MIT education.
D.
I have been impressed with the urgency of doing. Knowing is not enough; we must apply.
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