多选：类似数字符号的种类包括（）A．西文半角B．中文番号C．罗马番号D．西文番号

[完型填空] “Mom, can I have some money?” Those are the words my mother used ...

在混凝土用砂量不变的情况下，砂的级配良好，说明（）A．砂的空隙率大B．砂的空隙率小C．砂的总表面积大D．砂的总表面积小

[交际用语]Is that seat taken? ____________.A Please don’t worry. B I don’t think s

对于有人值班的变电站，由当班值班人员负责对断路器进行巡视检查。A．正确B．错误

[阅读理解] It has been reported that in colleges across the United States, t...