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More and more people like shopping on the Internet. They pay the money, soon get the packages (包裹) and may see some signs on them. What do the signs mean? Let’s take a look.
1．There is a red glass in the first sign. Under it, there is the word “FRAGILE”. It means things in the package are easy to break. We should be careful when I handling it. The sign beside it also means we should handle the package carefully.
2．This sign is easy to understand. It means we should keep the things in the package away from water, just like the umbrella does in the picture.
3．This sign means “No fire”. Things in the package may burn very easily, we should keep it away from fire for safety.
4．There is a thermometer in the sign. It is often on packages with food or drinks. The sign tells people the right temperature (温度) for the things inside.
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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
