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There are some public (公用的；公共的) numbers. Do you know when to use these numbers? 110 is a number for calling policeman when (当……时候) you have met some illegal (违法的) things. 119 is a number for a fire (火灾) accident (事故). 120 is a number for asking medical (医疗的) help when somebody is seriously ill (重病) or hurt (受伤). Please do not dial (拨号) these numbers for fun (乐趣).
110 119 120
1．be lost in the street _________
2．be seriously ill _________
3．fire accident _________
4．be hurt by car _________
5．meet some thieves (小偷) _________
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
