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问题 单项选择题

有一对称三相负载，每相的R=16Ω，XL=12Ω，△接法，接在线电压为380V的电源上使用时，电路的功率因数是（）

A.1.33

B.0.75

C.0.6

D.0.8

答案

参考答案：D

单项选择题 A1型题

关于"起源于围生期的情况（P00-P96）"理解正确的是（）

A.仅包括胎龄满28周至出生后7天内发病的情况

B.仅适用于婴儿

C.仅适用于成人

D.包括起源于围生期但在以后发病的情况

E.以上均不正确
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阅读理解

 

Apple iPad Mini Wi-Fi 16 GB - Black & Slate   $329 online    71 reviews  
October 2012 - Apple - Handheld - 16 GB - iOS - Wi-Fi Only - 7.9 inch - With Camera - 10.9 ounces（1 pound ="16" ounces）
With a touch screen and the ability to take an awesome 360-degree picture from the top of a mountain, its 7.9-inch display more than measures up to the complete iPad experience. View web pages. See where you are and what's around you using online maps. Flick（浏览） through your photos and watch videos in vivid detail. And wave hello to the family on a video call. With the same LED backlight technology and the same fast, fluid performance that the iPad is known for, the iPad Mini doesn't disappoint customers. And with automatic shake-resistant video, your videos are instantly ready to share.
 

Apple iPad 2 Wi-Fi 16 GB – Black       $350 online     2,564 reviews
March 2011 - Apple - Handheld - 16 GB - iOS - Wi-Fi Only - 9.7 inch - With Camera - 10 hour battery -1.32 pounds
This device has two cameras, a dual-core（双核） A5 chip, and the same battery life – all in a thinner, lighter Multi-Touch design. It makes surfing the Web, checking email, watching movies, and reading books feel natural. LED backlighting makes everything you see remarkably vivid and bright. With every turn of the device (even upside down), the display adjusts to fit. It has a wide, 178° viewing angle.
 

Apple iPad 1 Wi-Fi 32 GB        $600 online     454 reviews       
May 2010 - Apple - Handheld - 32 GB - iOS - Wi-Fi Only - 9.7 inch - 1.5 pounds  
Apple iPad 1 Wi-Fi is a magical and revolutionary product and the best way to experience the web, email, photos, and video. Taking advantage of the large multi-touch screen and advanced capabilities of the iPad, you can do things that you can't do on any other device. The high-resolution（分辨率）, 9.7-inch LED-backlit display on the iPad is remarkably vivid. Thin and light and with a wide viewing angle, it automatically locates available Wi-Fi networks.
 
小题1:According to the advertisement, which of the following statements is TRUE?
A．The Apple iPad 2 has a single core and 360-degree viewing angle.
B．The Apple iPad Mini can store as much information as the Apple iPad 2 can.
C．The Apple iPad Mini’s performance is disappointing compared to that of others.
D．The Apple iPad 1 is the oldest, the most expensive and the smallest of all three.
小题2:According to the advertisement, which one probably attracts most attention?
A．Apple iPad 2B．Apple iPad Mini
C．Apple iPad 1D．Dual-Core A5
小题3:We know from the advertisement that____________
A．we can’t voice chat with friends using the Apple iPad Mini.
B．we need to locate available Apple iPad 1Wi-Fi networks ourselves.
C．with the Apple iPad Mini, your videos always remain relatively smooth.
D．the Apple iPad 2 display only adjusts when the device is turned upside down.
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