(1)环境化学-------水是生命之源,写出一种节约水的措施_____
(2)农业化学-------化肥对提高农作物产量具有重要作用,尿素(CO(NH2)2)属于_____(选填“氮”、“磷”或“钾)肥;
(3)“低能耗、“低废水”、“低废弃物”是低碳理念的重要内涵,如下列 A、B 做法符合“低碳理念”,请你再补充一种做法。
A 推广无纸化办公
B 用旧报纸制铅笔杆
C _
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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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