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【单选题】
要 MCS-51 系统中,若晶振频率屡 6MHz ,一个机器周期等于 ( ) μ sA.
1.5
B.
3
C.
1
D.
2
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【简答题】[A] variation [B] balance [C] frequency [D] stability
【单选题】Which one is not the mainstream Western international politics theory?
A.
Realism
B.
Normative theory
C.
Liberalism
D.
Constructivism
【单选题】Which statement is theory, not fact?( Text 4A)
A.
Mutations are easiest to find in mtDNA and in the Y chromosome.
B.
Almost no archeological evidence of the human journey from Africa to Australia has been found.
C.
Bodies discovered at Lake Mungo are about 45,000 years old.
D.
Humans traveled along the coast of a land bridge between Siberia and Alaska.
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