【单选题】水磨石构件,按设计图示尺寸以体积计算,不扣除( )以内的空洞所占体积。
【单选题】Portable devices are becoming lighter and more appealing. Books are being (1)_____ into digital form. by the thousands. The most important (2)_____ forward may be in 'digital ink,' the technology used...
【单选题】下列选项中,属于非活性混合材料的是()。
【单选题】According to the rules, students must not ____ their books during examinations.