A:C3H8
B:C4H8
C:C5H8
D:C7H8
如图所示,电源电压保持不变时,闭合开关后,当滑动变阻器滑片P向右滑动过程中,则 ( )
昨天是奶奶的生日,以An interesting birthday party为题…提示词:1. birthday , yesterday , morning2. go, the shop, buy , presents,3. go , see, presents , have a good time .4. go home until , nine o’clock , evening.An interesting birthday party
下列能与120°E经线组成经线圈的是( )