人们通常按金属密度的大小将金属分类，把密度小于4.5g/cm3的金属叫做轻金属，密度大于该值的叫重金属。（）
参考答案：对
患者，女，50岁。甲亢症状较轻，甲状腺中度肿大。治疗应选用（）
A．抗甲状腺药物
B．无机碘液
C．普萘洛尔
D．放射性碘治疗
E．手术治疗
The recruitment of Chinese laborers was not universally accepted in racially conscious 19th century America and some white workers were unsettled by their appearance in large numbers.
