The Dress That Turns into a Coca Cola Machine This specially designed dress looks like a normal dress，but if you unfold it and cover yourself，you may look like a Coca Cola vending machine（自动售货机）. Because there are many vending machines like that on the street，it must be easy for you to hide．If you feel that someone is following you or there is some danger，you can disappear within five seconds．But don't use it to scare your classmates．That'll be rude. The M-Dress is a nice black dress．It is also a mobile phone．It accepts a standard SIM card and allows the wearer to receive calls without carrying an actual(真实的) phone in their pocket or purse．You just need to bring your hand to your ear when you want to answer a phone call．When you finish talking and release your hand，the call will close．It is fashionable and useful．But it will certainly be an embarrassing moment when your dress rings in public． Air Conditioned Jackets You will love these air-cooled jackets in summer time when it is very hot outdoors．The jacket has fans that draw air in．The fan is powered by an inside battery．Now it is possible to spend nearly every second of your day with cool air．
如图所示，一轻质弹簧的一端固定在滑块B上，另一端与滑块C接触但未连接，该整体静止放在离地面高为H=5m的光滑水平桌面上．现有一滑块A从光滑曲面上离桌面h=1.8m高处由静止开始滑下，与滑块B发生碰撞并粘在一起压缩弹簧推动滑块C向前运动，经一段时间，滑块C脱离弹簧，继续在水平桌面上匀速运动一段后从桌面边缘飞出．已知mA=1kg，mB=2kg，mC=3kg，g=10m/s2，求：
1mol CH4与Cl2发生取代反应，待反应完成后，测得四种取代物的物质的量相等，则消耗Cl2的物质的量为（ ）
从上面看到的形状是( )
与红细胞吸收K+有关的条件是（ ）
