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Mr Wen is a reporter. In the past, he rode a horse to Beijing. Now he goes there by plane. He can do more work now.
Ms Yang is a teacher. In the past, she had class with a blackboard. Now he taught his students on the line. They use computers.
Mr Zhang is a photographer. In the past, he used film to take photos. Now he uses a camera. He can see his photos quickly.
Mrs Li is a worker. In the past, made things by hand. Now he makes things with a robot or a machine(机器).
Name | job | Tools (工具) for work | |
in the past | now | ||
Mr Wen | reporter | take a plane | |
Ms Yang | teacher | computer | |
Mr Zhang | photographer | film | |
Mrs Li | by hand | with a | |
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
