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【简答题】
下图所示电路中,运算放大器为理想的,R w 为电位器。试证明ab间的等效电容C ab =(1-k)C,式中k为电位器R w 的分压系数。
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【单选题】The main disadvantage of wind power is that it______.
A.
is competitive
B.
produces more pollutants
C.
is low in efficiency
D.
is ugly
【单选题】I’ve bought an English dictionary which you can ____ if you meet new words.
A.
get to         
B.
come to          
C.
refer to       
D.
look up
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【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
【简答题】Despite there being so many advantages to using a heligimbal, the main disadvantage is that
【单选题】This is not an economical way o get more water; , it is very expensive.
A.
on the other hand
B.
on the contrary
C.
in short
D.
or else
【单选题】This is not an economical way to get more water; _________,it is very expensive.
A.
on the contrary
B.
on the other hand
C.
in a word
D.
rather than
【单选题】According to the passage, the main disadvantage of person-on-the-street interviews is that they
A.
are not based on a representative sampling
B.
are used only on television
C.
are not carefully worded
D.
reflect political opinions
【单选题】A) It has a solid plastic frame. B) It consists of an inner and an outer tent. prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> C) It is very convenient to set up. D) It is sold...
A.
It has a solid plastic frame.
B.
It consists of an inner and an outer tent.
C.
It is very convenient to set up.
D.
It is sold to many Continental countries.
【简答题】单词拼写。 1. You can _______  _______ (打电话给) Michael if you get to Fuzhou. He will meet you. 2. I think bad _______ (环境) can make people much stronger. 3. If you don't obey the traffic rules, you will ___...
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