①六年级举行“小发明”比赛,六(1)班同学上交了32件作品,六(2)班比六(1)班多交。六(2)班多交了多少件作品?
②一个精密仪器,在一张图纸上长32厘米,这个精密仪器在图纸中的比例尺是4∶1,实际长多少厘米?
③某种清洁剂浓缩液,按1∶4(浓缩液与水的体积之比)的比配制了一小罐32毫升的稀释液,其中浓缩液的体积是多少毫升?
A.①② | B.①③ | C.②③ | D.①②③ |
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