某校科学兴趣小组的同学将自制的植物标本分成两类,一类是蕨、葫芦藓、海带,另一类是黑松、小麦、玉兰,他们这样分类的依据是有没有[ ]
A.种子
B.根
C.茎
D.叶
A
下列叙述正确的是( )
A.由X变为X2-的反应是氧化反应
B.某反应中的氧化剂也可能有还原性
C.失去电子数多的还原剂,还原性一定强
D.有单质参加或生成的反应一定是氧化还原反应
A Web browser is simply a terminal emulator, designed to display text on a screen. The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with (1), and that it has a mechanism for(2) graphical files. Display text, display graphics, and (3) hyperlinks--there’s 99 percent of the (4) value. That’s not to say that the manufacturers didn’t go all-out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Remember when media channels in the browser were a big deal, instead of the clutter you can’t wait to delete from your favorites of bookmarks menu Remember when client-side Java applets were supposed to become the preferred(5)for application development Remember frames and all their nasty side effects
(5)是()
A.plane
B.plant
C.plate
D.platform