1.once ( )
A./wʌns/ | B./wʌnz/ | C./wɔns/ | D./wa:ns/ |
A./'ga:dən/ | B./'ga:dn/ | C./'gɔ:dn/ | D./'gʌdn/ |
A./trei/ | B./trai/ | C./tri:/ | D./tre/ |
A./həp/ | B./hʌp/ | C./hɔp/ | D./hip/ |
A./kin/ | B./kein/ | C./kain/ | D./kirŋ/ |
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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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