0.049×45保留两位小数是2.21______．
0.049×45=2.205≈2.21；
故答案为：正确．
I can think of many cases, ________students obviously knew a lot of English words and expressions but couldn’t write a good essay.
A．which
B．as
C．what
D．where
小明同学在家里用电加热器（俗称“热得快”）给暖水瓶中1.5kg的水加热10min，水温从20℃恰好升高到100℃．求：
（1）水吸收的热量是多少？
（2）小明家的电能表标着3000r/kW•h，在这10min内电能表的转盘转多少转？
