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Students in China are required to learn first aid at school as part of health education. It aims to improve their 1． (能力) to deal with a first aid emergency (紧急情况).
According to a survey, there is one sudden death each minute because the person’s heart 2． (stop) beating. A sudden loss of heart working will lead to brain damage (损害) within four to six minutes and then death after another five minutes. So, it is very i3． for the patients to receive CPR within four to six minutes. However, only about 4.5 % of such patients have a chance of receiving it 4． time. That’s because besides medical workers, most people do not have knowledge of first aid. In fact, about 60% of these 5． (accident) happen out of hospital, so it’s necessary for more people to learn the skill of first aid including CPR. That can make a huge difference in saving lives.
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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
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
