关于同温同压下等体积CO2和CO的叙述:①质量相等 ②密度相等③所含分子数相等④所含碳原子数相等。其中正确的是
A.①②③④
B.②③④
C.③④
D.③
答案:C
(2013·吉林市期末,33)I'm told that languagepractising.com is a free website ________ learners can not just learn various languages but also chat online.
A.where
B.which
C.that
D.what
大叶性肺炎患畜典型热型是()
A.弛张热
B.波浪热
C.回归热
D.不定型热
E.稽留热