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C3S形成的条件是有一定的液相。
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pIsub2/sub=Isub3/sub/pB
pIsub2/sub=4Isub3/sub/pC
pIsub2/sub=2Isub3/sub/pD
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单选题已知某线声源长度为l0,在线声源垂直平分线上距线声源r0和r的分别为Lp(r0)和Lp(r),根据《环境影响评价技术导则声环境》,按公式Lp(r)=Lp(r0)-15lg(r/r0)近似计算该线声源的噪声影响时,应满足的条件是()。A
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prIsub0/sub/3且rsub0/subIsub0/sub/3 /pC
pIsub0/sub/3rspanI/spansub0/sub且Isub0/sub/3rsub0/subr0Isub0/sub /r0/pD
p无条件限制 /p
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