通过检测供血者的HIV抗体来保护受血者属于（）
A.一级预防
B.二级预防
C.三级预防
D.常规报告
E.哨点监测
参考答案：A
The young man made a ________ to his parents that he would try to earn his own living after graduation.[ ]
A. prediction
B. promise
C. plan
D. contribution
()是指商品集中、出货、保管、包装、加工、配货、配送、信息的场所或经营主体。
A．转运型物流节点
B．配送中心
C．物流中心
D．物流园区
