【单选题】与外螺纹的牙顶相重合的圆的直径称为螺纹的( )。
【单选题】与外螺纹牙底或内螺纹牙顶相重合的假想圆柱直径称为()。
【简答题】在国际单位制灼基本单位中,热力学温度的计量单位名称是( ),计量单位的符号是( )。
【判断题】仪器仪表验收主要包括仪器名称、规格型号、量程、分辨率、外观等。
【判断题】Water stains on the hotel floor can cause guests to slip and get injured.
【简答题】Many parts of this machine are made of flammable plastic.Never place hot or burning objects on or near the washing machine. When disconnecting the power cord from the power outlet,always take hold of ...