钢筋混凝土楼盖按施工方式不同有___、__、___三种形式。
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
钢筋混凝土楼板按施工方式不同,分为( )。
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