融资备用信用证
参考答案：
是指开证行保证申请人的付款（包括偿还借款）义务的备用信用证。
My mother didn't ____ us leaving Kunming at once, so we had to stay there for ____ two days. [ ]
A. approve; other
B. approve of; more
C. approve of; another
D. approve; the other
DZS型输油泵泵内（）间隙采用自行浮动调整，以减少级间泄漏，提高了泵的容积效率。
A.叶轮
B.轴承
C.轴套
D.口环
