各类文稿.记录与单据保管期为二年的().
A.无线电信号书
B.电台工作日志
C.气象报告和航行警告
D.通导设备维护保养记录
参考答案:B
—Would you mind the room?
—Certainly not. I'll do it right away.[ ]
A. clean
B. cleaned
C. cleaning
D. to clean
298K时,标准态下Cu2++FeαCu+Fe2+达到平衡时,则此反应的等于()。(已知:)
A.2×0.787/0.0592
B.0.787/0.0592
C.0.0592×0.787/2
D.0.0592/0.787