(1)现有硬塑料圆管、自行车内胎、铁垫圈、细塑料管等材料,可供制作各个部件时选用。制作筒身需要的材料是 ,制作活塞的圆橡皮需要的材料是 。(2分)
(2)提压手柄抽水比较费力,要求运用杠杆原理做出改进,在答题卡图上画出。(2分)
(3)在抽水时出水管不出水,可能的原因是(写出1个) (筒身破损/出水管破损/阀门推不开/活塞杆生锈)。(2分)
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