A.测定空气中氧气含量时,红磷熄灭后立即打开弹簧夹,则测量结果偏大 |
B.分解过氧化氢溶液制氧气时忘记加二氧化锰,则收集的氧气量偏小 |
C.量取15mL水时俯视读数,则实际取水的体积偏小 |
D.用托盘天平称取5 g食盐的过程中(1g以下用游码),误将药品放在右侧托盘,则实际称取的食盐质量偏小 |
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