【单选题】Sally had a third again as many as David, who had a third as many again as Francis. Altogether they had 1How many did David have?
【判断题】金属指示剂本身的颜色易受溶液pH值的影响。( )
【判断题】防止辣椒疫病的途径是降低空气湿度控制温度改良通风条件、避免连作、选用无病种子垄作定植壮苗采用膜下暗灌或滴灌。
【判断题】金属指示剂本身的颜色易受溶液PH 值的影响。
【简答题】如果内存变量和字段变量均有变量名“姓名”,那么引用内存变量的正确方法是( )。
【判断题】圆锥滚子轴承适合于当转速较低,同时受径向载荷和轴向载荷,要求便于安装的场合
【单选题】如果内存变量与字段变量均有变量名姓名,引用变量名的正确方法是( )