向流分配法 counter -current distribution method 反选择；反淘汰 counter selection 对比染色 counter stain; contre -coloration ..
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counter-selection 逆选择
stroke counter selection 行程计数器选择
sacB counter-selection 蔗糖反向选择
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It is called counter selection when there is a behavior of concealing information before signing a contract and called moral risk after signing a contract.
发生在契约签订前的隐瞒信息行为叫逆向选择，发生在契约签订后的隐瞒信息行为叫道德风险。
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Request samples at a Kiehl's store (where the selection is usually larger) or a Kiehl's counter in a department store.
CNN: 23 surprising things you can get for free
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