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【单选题】
The World's Best Telephone Headsets The Olassen Wireless Telephone Headset represents a revolution in telephone headset design. Every headset contains two embedded microphones. The first microphone picks up every nuance in your voice before transmission the second microphone filters out unwanted background noise. The result is an enhanced signal that sounds even better than face-to-face conversation. This revolutionary microphone technology is further enhanced by a speaker that includes base amplification, so you hear the full voice of the person on the other end of the line. Find the nearest Olassen retail outlet at www.olassenacoustics.com, or call 1-888-845-9000. What is a feature of the Olassen Wireless Telephone Headset?
A.
It has two microphones.
B.
It has adjustable headphones.
C.
It has lightweight earphones.
D.
It has a digital volume control.
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【单选题】These items are just for show —— they are not ________.
A.
on the sale
B.
for sale
C.
in sale
D.
for sell
【简答题】The study of 2,000 Brits found the average wardrobe contains 152 items, but just 44 percent of these are worn regularly.
【单选题】These items are just for show. they are not ________.
A.
for sell
B.
on sale
C.
for sale
D.
on sell
【简答题】阅读问题:“已知曲线C 1 :xy+2x+2=0与曲线C 2 :x-xy+y+a=0有两个公共点,求经过这两个公共点的直线方程.” 曲线C 1 方程与曲线C 2 方程相加得3x+y+2+a=0,这就是所求的直线方程. 若曲线x 2 +2y 2 =1与曲线3y 2 =ax+b有3个公共点,且它们不共线,则经过这3个公共点得圆的方程是______.
【简答题】已知椭圆 经过点 ,且其右焦点与抛物线 的焦点 重合,过点 且与坐标轴不垂直的直线与椭圆交于 两点. (1)求椭圆 的方程; (2)设O为坐标原点,线段 上是否存在点 ,使得 ? 若存在,求出 的取值范围;若不存在,说明理由; (3)过点 且不垂直于 轴的直线与椭圆交于 两点,点 关于 轴的对称点为 , 试证明:直线 过定点.
【简答题】已知椭圆 经过点 ,离心率为 . (1)求椭圆 的方程; (2)直线 与椭圆 交于 两点,点 是椭圆 的右顶点.直线 与直线 分别与 轴交于点 ,试问以线段 为直径的圆是否过 轴上的定点?若是,求出定点坐标;若不是,说明理由.
【简答题】B类IPv4地址的主机标识长度位_____位,最高两位二进制为_____。
【简答题】Traveling for business can be exhausting, especially if you have to fly internationally over just few days, or go straight to work when you arrive. Still, there are helpful things you can do before, d...
【简答题】已知中心在原点,焦点在 轴上的椭圆 的离心率为 ,且经过点 ,过点 的直线 与椭圆 相交于不同的两点 . (Ⅰ)求椭圆 的方程; (Ⅱ)是否存直线 ,满足 ?若存在,求出直线 的方程;若不存在,请说明理由.
【单选题】These items are just for show--they are not_____.
A.
on the sale
B.
for sale
C.
in sale
D.
For sell
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