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【单选题】
倾斜角为 的直线l经过抛物线 (p>0)的焦点, 且与抛物线相交于A、B两点(点A在x轴上方).则 的值为()A.
1
B.
2
C.
3
D.
4
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【多选题】Water wheels are machines that use the energy of ______ to turn a wheel. The axle of the turning wheel can then power other machines to do work.
A.
flowing water
B.
or falling water
C.
or both
D.
neither of them
【简答题】造成直流放大器零点漂移的两个主要原因是(1) 变动,(2) 变动。
【简答题】完成实例17、22
【简答题】造成直流放大器零点漂移的两个主要原因是( 1 ) ,( 2 ) 的变化。
【单选题】The reason why the first type of perpetual motion machine cannot be successfully manufactured is ( )
A.
energy can neither be created nor destroyed
B.
the loss of work in the actual process is unavoidable
C.
the only forms of energy transfer are heat and work
D.
not all the heat can be converted successfully
【单选题】It is never easy to identify the complexity of the negotiating subject and the priority when it comes to the agenda-making phase in international business negotiation. Some simple issues could be easi...
A.
From easy to difficult.
B.
From difficult to easy.
C.
Both are OK.
D.
Neither is OK.
【单选题】According to the text, what can we learn about aviation fuels?
A.
Biofuels can be used as replacement for vehicles as well as planes.
B.
Neither biofuels nor coals can be used for planes.
C.
The idea of green fuel is to change solar energy into fuels.
D.
The idea of green-fuel, which is only an illusion, is challenged and doubted by scientists.
【简答题】造成直流放大器零点漂移的两个主要原因是(1)___________变动,(2)_______________变动。
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