如图所示的电路图中与实物图对应是( )
一个角的两边开口越大,这个角就越____。(用”大"或者"小"作答)
347 =
6330 =
1311 =
3913 =
呼吸系统的组成包括( )
When the competition ____ (start), David was still making his way to school.