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A clock
This is a clock. It’s on the wall of my room. Maybe you don’ t know it. Now let me tell you something about it. It has two hands. One is long, the other is short. The long hand is minute hand and there are 60 minutes in an hour. The short hand is the hour hand and there are 24 hours in a day. What time is it now? It’s two o’clock. I must do my homework now. Goodbye.
1．The clock is on the wall of my room.2．The long hand is the hour hand.
3．There are 60 hours in a day.
4．There are 140 minutes in a day.
5．You may know the time from the clock.
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
