Exposure to beryllium may cause chronic beryllium disease(CBD),which affects mainly the lungs and can be fatal....

目的:考察初中生校园受欺负的发展变化轨迹。方法:利用校园受欺负量表(CBSS)对606名在校初中生重复测量3次,相邻时间点间隔5个月,......