小明用如图所示装置探究水和煤油的吸热能力，实验记录如下表：                                                                                                                                                                                                                                               

加热时间/min	0	1	2	3	4	5	6	7
水的温度/℃	20	22	24	26	28	30	32	34
煤油温度/℃	20	24	28	32	36	40	44	48