同一幕墙工程应采用同一品牌的单组分或双组份的硅酮结构密封胶，并应有保质年限的质量证书，用于石材幕墙的硅酮结构密封胶还应有证明无污染的试验报告。
1、正确正确
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Johnsonwas________unknownbeforerunningforthepresidency.
Hecannotchoosehisownjob,________canI.
Thesyntacticrulesofanylanguageare______innumber.
ThechildhoodofTomSawyerandHuckFinnintheMississippiisarecordofavanishedwayoflifeinthe()Mississippivalley
______ofasentencedependsonthecontextinwhichthesentenceisuttered.
