2009版保养制度规定，在车辆各级保养过程中，要使用手供油装置检查供油情况，确保供油良好。
参考答案：对
Tom reads at an average rate of 30 pages per hour, while Jan reads at an average rate of 40 pages per hour. If Tom starts reading a novel at 4: 30, and Jan begins reading an identical copy of the same book at 5: 20, at what time will they be reading the same page
A．9:30
B．9:00
C．8:40
D．7:50
E．(E) 7:00
下列除哪一项外都是肠套叠的症状（）
A.便秘
B.可见肠蠕动
C.血便
D.呕吐
E.无疼痛
