We （） you that regular orders will follow if this order is executed to our entire satisfaction.
A. ensure
B. make sure of
C. assure
D. insure
查看答案
下列除哪项外，均为乌梅丸的主治证候
A. 食入吐蛔
B. 脘腹刺痛
C. 烦闷欲呕
D. 于足厥寒
E. 久泻久痢
Problems of long （） should be settled with great care.
A. time
B. period
C. standing
D. term
We are sorry that the goods you （） are out of stock at the moment.
A. demanded
B. demand
C. required
D. require
如果我们要计算两种非离子表面活性剂混合后的HLB值，下列哪个公式适用。设WA、WB为表面活性剂的质量，HLBA和HLBB为A、B两种表面活性剂的HLB值
A. HLBA+HLBB
B. (HLBA×HLBB)1/2
C. (WA×HLBA＋WA×HLBA)/(WA＋WB)
D. (HLBAwA×HLBBwB)1/(wh，wu)
E. (HLBA＋HLBB)/2
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