题型:名词解释 已知化学反应2C(s)+O2(g)点燃.2CO(g);2CO(g)+O2(g)点燃.2CO2(g)都是放热反应.据此推断,下列说法不正确的是(相同条件下)( )A.56g CO和32g O2所具有的总能量大于88g CO2所具有的总能量B.12g C所具有的能量一定高于28g CO所具有的能量C.12g C和32g O2所具有的总能量大于44g CO2所具有的总能量D.将两份碳燃烧,生成CO2的反应比生成CO的反应放出的热量多 查看答案
题型:名词解释 Some of the keys have a special use. There are referred to as command keys. The 3 most common are the Control or (66) , Alternate or (67) and the Shift keys though there can be more (the Windows key for example or the Command key). Each key on a standard keyboard has one or two characters. Press the key to get the lower character and hold Shift to get the upper. Disk Drives - All (68) need a drive to get information off - or (69) - and put information on the disk - or (70) . Each drive is designed for a specific type of disk whether it is a CD, DVD, hard disk or floppy. Often the term ’disk’and ’drive’are used to describe the same thing but it helps to understand that the disk is the storage device which contains computer files-or software - and the drive is the mechanism that runs the disk.A.CONB.CTRLC.COTLD.CTR 查看答案