Which statements are Not an offer (发盘)？
A. It’s not possible for us to make any sales at this price.
B. They start at one hundred and fifty yuan and go up to two hundred yuan.
C. I can't make a decision at this time.
D. These are FOB prices.
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熏烟（或漫烟）过程多发生在 （ ），因地区和季节不同，熏烟过程持续时间一般为0.5-2h。
A. 傍晚8:00-10:00
B. 早晨8:00-10:00
C. 下午5:00-6:00
D. 晚上
何谓“封闭型”大气扩散？
A. 下部存在逆温层
B. 全层逆温
C. 上部存在逆温层
— You are asking too much for this part.— _________________________ .
A. Yes, so we had better look over your specifications.
B. We have some cheaper ones.
C. Sure, I'll bring it in next week.
D. We'll try one case of this.
现代物流系统的支撑要素( )。
A. 制度
B. 法律
C. 行政
D. 标准化系统
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