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Food to people is as fuel to cars. Good fuel helps cars run f1． and better. So, if you want to stay healthy, you have to know w2． foods are good for you.
The food p3． can show us how much of each kind of food we need every day. Remember to eat all kinds of food every day. Our body n4． more than 40 different nutrients. Scientists say that a junior high school student may need about 6 pieces of bread, 700 grams of vegetables,3 cups of milk,3 apples and a small dish of chicken. But this isn't the same for e5．. It depends on your body type and how much e6． you do.
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
