投标保证金应当在投标有效期满后30天内一直有效，其目的是给借款人在需要索取保证金时，有足够的时间采取行动。
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It is apparent that there was not sufficient depth of water（）and I claim that the estimated arrival draft as radioed to the agent to report to you was a close one.
A. for my vessel crossing safely
B. my vessel is to cross safely
C. for my vessel to cross safely
D. for my vessel's crossing safely
提高塔回流量，可以提高塔釜温度。
A. 正确
B. 错误
陶器的分布以长江以南东南广大地区的（）有名。
A. 彩陶
B. 黑陶
C. 赭石陶
D. 几何印纹陶
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