下列有机物属于烃的是( )
A:C2H5OH
B:CCl4
C:C2H6
D:CH3COOH
—She only got home a short while ago.
—But we were not ready for that at that time.
下列有关旅游活动历史发展阶段的叙述不正确的是( )
小明同学按照下图所示的电路进行实验探究,两个灯的规格相同.当开关闭合时,其中一个灯亮,一个灯不亮,电压表有示数.则故障原因可能是( )