— _____ 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？
