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【简答题】
如图所示的同步RS触发器，【图片】，当时钟脉冲信号CP=0，则G3和G4两个与非门对于输入信号R和S来说相当于 ，因为不论R、S为都不影响两个门的输出结果，且G3、G4的输出为 ，那么对于由G1和G2组成的基本RS触发器来说，此时两个输入均为1，故此时整个触发器的输出Q为保持上一时刻状态。
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【单选题】Why cholesterol levels in people are higher in winters?
A.
Because there is not enough vitamin D in the body.
B.
Because people don't exercise enough in winters.
C.
Because the temperature is lower in winters.
D.
Because people do not receive enough sunshine during winters.
【单选题】We are sure that wee _______ our second project by the end of the next month.
A.
will have completed
B.
completed
C.
had completed
D.
were completing
【单选题】听力原文： Key players in the Congo Kinshasa war are holding talks about the next steps to take following, the rebel take-over Monday of a strategic city of Kindu. Zimbabwe's President Mugabe accused Rwand...
A.
the next steps to take
B.
the next agreement to reach
C.
the next announcement to make
D.
the next cease-fire to arrange
【简答题】阅读理解。 The Arts Cinema is open 7 days a week, showing lots of American and foreign films. Next week it will show an Australian film called 'Midnight Meeting '. It is set in Sydney in the 1960s.You can ...
【简答题】A．There is not enough financial support from the government. B．There are more retirees taking money out of the system, and not enough additional workers to support them. C．More and more people refuse ...
【单选题】My friend Jennifer, ____ help I’ve made great progress in my studies, will leave for Canada next week.
A.
in whose
B.
in her
C.
with whose
D.
with her
【单选题】In some countries bathing is expensive because ______.
A.
there is not enough water
B.
electricity and wood are expensive
C.
there are not many baths
D.
bath-houses are rare
【单选题】According to paragraph 6, why is water a problem?
A.
There is not enough water available in the world.
B.
Plants and animals are using the water that humans require.
C.
Distribution of water where it is needed can be difficult.
D.
Most of the water is too old to be used safely.
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