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搜题
【单选题】
混凝土保护层是指从什么钢筋的外边缘到混凝土近表面的距离?A.
纵向受力钢筋
B.
纵向架立筋
C.
箍筋
D.
腰筋
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】已知数列 为等比数列，且 ，设等差数列 的前 项和为 ，若 ，则
【多选题】Choose the following sentences if you think that "serve" has the same meaning as "satisfying".
A.
But the study shows that principal among them is the work of library staff to serve the information needs of the communities.
B.
This could mean the closure of thousands of small businesses which serve the community.
C.
Almost no politician in the US runs for office without begging huge campaign funds from the rich – so when they are elected, they must serve their interests, not ordinary Americans’.
D.
Leo is currently serving a life sentence for murder.
【简答题】已知数列 为等比数列，且 ，设等差数列 的前 项和为 ，若 ，则 .
【简答题】设等差数列 的前 项和为 ，若 ，则 ．