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【单选题】
在含 n 个顶点和 e 条边的无的邻接矩阵中, 零元素的个数为( )A.
n 2 -2e
B.
n 2 -e
C.
2e
D.
e
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【单选题】It is not very healthy t o jog beside a motorway because of the .
A.
many accidents
B.
bicycles
C.
Air pollution
D.
other people
【简答题】Slang is a popular, less official and often very current form of language. It is an important part of a living language and is constantly changing as language changes. Slang is often playful, direct a...
【单选题】The main disadvantage of the automation system is()
A.
it increases pilot workload
B.
it makes more errors
C.
when manual operation is necessary, take over operation becomes difficult
【简答题】绘制、识读电路图应遵循的原则有：主电路图要画在电路图的______侧，并______于电源电路。
【单选题】According to the passage, the main disadvantage with reconfiguring diet to lessen water usage is
A.
most North Americans would be unlikely to shift their diets simply in order to accommodate the exigencies of water conservation
B.
the gains provided by diets with less water-intensive production would likely be less useful in areas with greater aquifer resources
C.
people in Asia and certain European countries are dependent on meat-products and could not do without them
D.
diets with less water-intensive production tend to be less healthy than those with more water-intense production
E.
governments of certain countries would be unlikely to promote programs for diet change given their possible negative effect on those countries' economies
【单选题】Bypass operation has become very popular in the United States because ______.
A.
it is one of the most common major operations
B.
it is more effective than any other medicine
C.
the standard of living in America is much higher than that in any other country
D.
it can bring more money to the hospitals and doctors
【简答题】The chair looks rather unusual in shape, but it is very comfortable to sit ______. A) by B) on C) with D) at
【单选题】识读控制电路包括( )。
A.
弄清控制电路的电源电压。
B.
按布局顺序从左到右依次搞清辅助电路各条支路如何控制主电路。了解电路中常用的继电器、接触器、位置开关、按钮等电器的用途，分析动作原理以及对主电路的控制关系。
C.
分析出控制电路的动作过程。结合主电路有关元器件对控制电路的要求分析。
D.
以上三者都包括
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