A.白天幼兒游戲時(shí) B.傍晚幼兒離園后 C.午后幼兒午睡時(shí) D.晨間幼兒進(jìn)班前
A.光滑、堅(jiān)硬 B.毛糙、堅(jiān)硬 C.光滑、有彈性 D.保暖、防滑
A.10~15cm B.20~25cm C.30~35cm D.40~45cm