【判断题】Today about half of the Welsh speak Welsh as their first language.
【判断题】物料平台临边应设置不低于1.5m防护栏杆,栏杆内侧设置硬质材料的挡板。
【判断题】7 Today, a quarter of the Welsh still speak Welsh as their first language. _________
【判断题】根据行为主义心理学理论,行为的实施与心理动机无关。
【单选题】[6.3] [TB-2] 当 ( ) 时,应采取( )项措施