Hotels in Beijing usually ____ ____in winter.
如图所示为某一皮带传动装置.主动轮的半径为 ,从转动的半径为 .已知主动轮做逆时针转动,转速为n,转动过程中皮带不打滑.下列说法中正确的是( )
解释词语。
庇护:____ 。
熬煎:____ 。
根据拼音写汉字。
xié____持 hǎo____叟 chà____异 qí____祷 gěng____咽 ào____悔
—Why! I couldn't get you on the phone this morning.
—We ________ tennis in the yard when you phoned me.