学进去-教育应平等而普惠
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类型:阅读选择
难度系数:0.65
所属科目:高中英语

Outdoor cameras are the modern version of hiring a guard for your home. Below is a list of some quality outdoor security cameras available in the market.

Ring Floodlight Camera

The camera itself records in HD and you have plenty of support via the app. Through the app, you can talk to people through the camera.

The camera itself has no night vision. This is a problem in the event that the bulbs(电灯泡)burn out, which will happen eventually.

Campark Camera

Since this outdoor security camera is built for hunting, it is wireless and completely waterproof(防水的). Furthermore, its sensors are sharp and will naturally have night vision.

That said, there are a few downsides. Because of the higher sensitivity, this camera takes a lot of unnecessary pictures and videos. Furthermore, you'll need to supply an SD card to store videos and pictures.

Zumimall Camera

The security camera itself is 100% wireless, connects through Wi-Fi, and is battery-operated. It also has night vision and handles cold, heat, and rain very well.

The only point of criticism is the storage. The cloud storage offered is limited. For free, you can store your videos and pictures for up to seven days before the old pictures and videos are replaced.

ZOSI Security Camera System

It's a system including several security cameras, which pack a lot of qualities. They offer 80 feet of night vision, are weatherproof, and raise the alarm when they spot motion, etc.

The downside of this system is that these cameras need to be wired to a center. And the wiring can be disorganized and untidy.

Buy these cameras here.

1.What is a selling point of Ring Floodlight Camera?
A.Long battery life.B.Night vision.
C.High sensitivity.D.Support through the app.
2.If you use Zumimall Camera, you.
A.need to protect it from cold
B.will have unlimited cloud storage space
C.can connect it to the Internet without wires
D.can freely store the videos and pictures for a month
3.What do Campark Camera and ZOSI Camera have in common?
A.They need an SD card.B.They are built for hunting.
C.They require a wire center.D.They can stand up to water.
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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

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2019-09-19

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

用户名称
2019-09-19
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