A.测定空气里氧气含量时,若装置漏气,会导致测定结果偏高 |
B.除去粗盐中难溶性杂质的过程中,若蒸发时液体溅出,会导致产率偏低 |
C.验证质量守恒定律时,若不采用密闭装置,一定会导致反应前后质量总和不相等 |
D.配制一定溶质质量分数的溶液,若装瓶时洒出一部分,会导致溶质质量分数变小 |
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