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【单选题】
以下关于NPN 晶体管导通条件的说法正确的是（ ）。A.
基极和集电极相对于发射极为负电势
B.
基极和集电极相对于发射极为正电势
C.
三极管导通后UCE 是 0. 7V
D.
基极相对于发射极为负电势，集电极相对于发射极为正电势
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举一反三
【单选题】Suppose that scientists find evidence that proves chocolate pudding lowers cholesterol. We would expect to see
A.
no change in the demand for chocolate pudding.
B.
a decrease in the demand for chocolate pudding.
C.
an increase in the demand for chocolate pudding.
D.
a decrease in the supply of chocolate pudding.
【简答题】evidence that proves that a person was in another place at the time of a crime and so could not have committed it (ali: another, otherwise)
【单选题】Some solid evidence proves that water really exists on Mars, but unfortunately, there is still no of life.
A.
mark
B.
sign
C.
symbol
D.
signal
【简答题】vt. to provide evidence that proves sth.
【简答题】___________. additional proof that something that was believed (some fact or hypothesis or theory) is correct, the establishment of the truth or correctness of something by investigation or evidence, ...
【单选题】Scientific evidence proves that physical exercise always has positive influence on memory formation.
A.
T
B.
F
C.
NG
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