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【简答题】
确 定性信号可分为周期信号和非周期信号两类,周期信号的频谱是 ,非周期信号的频谱是 。
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举一反三
【单选题】The energy______by the chain reaction is transformed into heat.
A.
released
B.
relieved
C.
revealed
D.
resumed
【简答题】牛乳中的乳蛋白包括 、 及 ,在20°C下调节PH至4.6时沉淀的蛋白质属于 。
【简答题】In
this section, there is a passage with 10 blanks.You are required to
select one word for each blank from a list of choices given in the word
bank following the passage. Read the passage through c...
【单选题】It can be inferred from the passage that studies of endangered species ______.
A.
have revealed little of importance to improve wildlife preservation
B.
are more likely to be carried out when a financially concerned interest group is involved
C.
sometimes endanger the very species they hope to protect
D.
show that endangered species can never be saved except at great cost
【单选题】It can be inferred from the passage that studies of endangered species ______.
A.
have revealed little of importance to improve wildlife preservation
B.
are more likely to be carded out when a financially concerned interest group is involved
C.
sometimes endanger the very species they hope to protect
D.
show that endangered species can never be saved except at great cost
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