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【单选题】
哪项是爱德华菌属与大肠杆菌的不同?A.
硫化氢阴性.甘露醇阳性
B.
硫化氢阳性,甘露醇阴性
C.
硫化氢阴性,甘露醇阴性
D.
硫化氢阳性,甘露醇阳性
E.
IMViC为++--
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举一反三
【单选题】Why are scientists surprised by the findings in their noise study? ______
A.
Because noise is an unwanted waste for human beings.
B.
Because the world is becoming more and more noisy.
C.
Because they have learned that noise is also a kind of pollution.
D.
Because people knew little about noise before.
【单选题】I can ______ some noise while I’m studying, but I can’t stand very loud noise.
A.
put up with
B.
get rid of
C.
have effect on
D.
keep away from
【简答题】相位裕量是当系统的开环幅频特性等于1时，相应的相频特性离（）的距离。
【简答题】. 相位裕量是当系统的开环幅频特性等于 1 时,相应的相频特性离 () 的相位角。
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