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当前学科：地连墙工中级
题目：
单选
地下连续墙浇筑过程中，至少每隔（）min测量一次槽孔内的混凝土面深度。
A . 60；
B . 30；
C . 20；
D . 10。
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对于记账式国债，机构和个人都可以购买，而储蓄国债（电子式）的发行对象仅限于个人。
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