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【单选题】
下列气体中,无色无味的是( )。
A.
SO 2
B.
N 2
C.
NH 3
D.
Cl 2
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举一反三
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A.
twilight
B.
attentively
C.
currently
D.
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等级现象（非全或无，阈下刺激强度与局部电位成正相关）
B.
衰减性传导
C.
无不应期
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局部电位可以总和
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去极化小于阈电位
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A.
essential
B.
deadly
C.
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