A.天平不平衡,左边烧杯中的现象是固体完全溶解,产生气泡 |
B.天平不平衡,右边烧杯中的现象是固体部分溶解,溶液变为浅绿色,产生气泡 |
C.若将碳酸钙粉末换成锌粉,其它条件不变,天平最终平衡 |
D.若要使天平重新平衡,可以向左盘继续加入 4.4g 碳酸钙粉末 |
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