哪种有害金属元素中毒可引起骨痛病()。
A、汞
B、铅
C、砷
D、镉
E、锰
参考答案:D
了解来宾基本情况,包括其所在的单位、姓名、( )、级别及一行人数,以及到达的日期和地点。
A.学历
B.职务
C.薪酬
D.籍贯
Which of the following statements is true of dyslexia a. It is a worldwide problem. b. It is a regional problem. c. It is a social problem. d. It is a biological problem.