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多氯联苯别名氯化联苯，是联苯苯环上的氢原子为氯所取代而形成的一类氯化物。共有210种异构体，其中10多种具有二噁英类似毒性作用，称为类似二噁英化合物。
A.
正确
B.
错误
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【单选题】Rivers By original usage, a river is flowing water in a channel with defined banks. Modern usage includes rivers that are multichanneled, intermittent, or transient in flow and channels that are pract...
A.
are multichanneled in flow
B.
have clear banks
C.
include bankless channels
D.
exist for only a short time in flow
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【单选题】Rivers By original usage, a river is flowing water in a channel with defined banks. Modern usage includes rivers that are multichanneled, intermittent, or transient in flow and channels that are pract...
A.
are multichanneled in flow
B.
have clear banks
C.
include bankless channels
D.
exist for only a short time in flow
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