邮政营业部门的安全保密规定,信筒信箱按时开取邮件,开箱()由专人保管,不得随意悬挂放置。
A.钥匙
B.信兜
C.信袋
D.工具
参考答案:A
The world’s population has grown by ______ it was in 1800.
A.more than six times that
B.six times more than that
C.more than six times what
D.six times as many as
下列各项费用中属于内部故障成本的是()
A.降价费
B.工序控制费
C.不合格品处理费
D.进货测试费