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A high-tech zebra crossing with flashing lights and audio warning (语音提示) 1． (put) into use for the 2． (one) time in Bishan district, Chongqing a few months ago. It can also take pictures of the people who are against the traffic 3． (rule) in the area.
At a busy road in front of a gate of Bishan Middle School, the crosswalk is installed (安装) 4． (keep) the students safe when they cross the road after school.
The zebra crossing area has light strips. When people cross the street, they flash to “tell” 5． (drive) to slow down and wait for people to go across the street. At the same time, display screens (显示屏) on either side of the crosswalk tell people to only cross the street when the light 6． (be) green.
Jiang Fei, a traffic 7． (office) in Bishan, said that the lighting system was very useful in the evenings and on 8． (rain) and foggy days.
Rong Sheng from the school’s safety department said, “In the past, our school safety guards 9． (have) to stand in the middle of the road after school to stop the cars.”
Now the students feel 10． (safe) than before after the installation of the smart crosswalk.
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
