(1)将托盘天平放在水平桌面上,并将游码移至左侧零刻度线处,天平静止时如图甲所示。此时应将平衡螺母向
(2)将盛有适量食用油的烧杯放在已调平的天平左盘,在右盘中加减砝码并移动游码,天平再次平衡时如图乙所示;
(3)将烧杯中部分食用油倒入量筒,如图丙所示;再用天平测出剩余食用油和烧杯的总质量为107.8g,则该食用油的密度为
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2