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【简答题】
如图13.4.6所示电路中，已知激励电压为u 1 (t)，输出电压u 2 (t)的冲激响应为 。求：
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【单选题】It is still in question ______ a can of coke could stop thirst but ______ no doubt that it can make one _____. [ ]
A.
if; there is ; refreshed
B.
whether ; it is ; refresh
C.
that ; there is ; refresh
D.
whether ; there is ; refreshed
【单选题】Over several years, bacteria were isolated from members of a human population and tested for antibiotic resistance. The percent of bacterial isolates that were found to be antibiotic resistant is pres...
A.
The greatest increase in antibiotic resistance occurred from the first year to the third year of the study.
B.
Gene flow in the population occurred at the same rate for the entire duration of the eight-year study.
C.
Because evolution in bacterial populations occurs over millions of years, the results are due to random variation.
D.
Natural selection over multiple generations is favoring antibiotic resistance in the population of bacteria.
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