动物铅中毒的特效解毒药物是（）
A.双乙酸钠
B.乙二胺四乙酸二钠钙
C.枸橼酸三钠
D.苯甲酸钠
E.大观霉素
参考答案：B
— When was Tom born?
— He was born ______ December 10th,1968. [ ]
A. on
B. in
C. at
哪些货物运输使用货运票据封套？
