题目

Only when he conquered his inner feara newfound sense of accomplishment and self-confidence. A . did he gain B . he had gained C . he gained D . has he gained 答案：A用天平测量物体质量： 　　 (1)将天平放在水平桌面上，游码至零刻度线后，指针静止在如图(1)所示的位置则应将平衡螺母向________端调节． (2)测金属的质量，当天平盘中的砝码和游码的位置如图(2)所示时，天平重新平衡，则金属的质量是________克．