要除去二氧化碳中混有的一氧化碳,可把混合气体通过 ( )
A:点燃
B:炽热的炭层
C:澄清石灰水
D:灼热的氧化铁
(2016•黑龙江)读图,回答问题.
A number of new functions ________ to the computer since it was first invented in 1946.