— _____ colour is it?
— It's white. [ ]
A. Which
B. What
C. Who
答案:B
______是从事报关工作的资格证明。
A.报关员证
B.报关员IC卡
C.报关员资格证书
D.报关单位工作证
请叙述防静电措施,怎样防护电磁干扰?