选项 | 实验操作与现象 | 实验目的 |
A | 分别向2支试管中加入等体积、等浓度的![]() ![]() | 研究催化剂对相同条件下的![]() |
B | 向足量KI溶液中加入几滴![]() | 验证![]() ![]() |
C | 向盛有Cu片的试管中加入![]() ![]() | 验证![]() |
D | 向一干燥集气瓶中同时通入氨气和氯化氢气体,产生白烟 | 验证氨气具有还原性 |
A.A | B.B | C.C | D.D |
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同类型试题
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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
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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
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