We know a lot about
A.public sign | B.public sings | C.public signs |
A.mean | B.means | C.meaning |
A.things | B.the thing | C.thing |
A.should | B.can | C.can’t |
A.in | B.on | C.to |
A.be quiet | B.make noise | C.keep off the grass |
A.is mean | B.mean | C.means |
A.must | B.can | C.shouldn’t |
A.litter | B.no littering | C.touch |
A.quiet | B.quietly | C.be quiet |
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