脊髓灰质炎病毒的传播途径主要是____途径。
粪一口
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()是将经过编码的信息传达给受众的渠道。
下一篇:Complete each of the following sentences with a word derived from the one given in the bracket. It is ( )to reach the airport in such a heavy traffic. (possibility)
Complete each of the following sentences with a word derived from the one given in the bracket.
It is ( )to reach the airport in such a heavy traffic. (possibility)