A:C2H5OH
B:CH3COOH
C:CH3CHO
D:C6H5OH
When Tim ________ why he was late for school, he just kept silent.
关于导体中的电流与导体两端的电压的关系,下列叙述正确的是( )
小明对中国地理位置的描述中,错误的是( )
影响人口分布的决定因素是( )