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【单选题】
某建筑工程采用打人式钢筋混凝土预制方桩，桩截面边长为400mm，单桩竖向抗压承载力特征值RA=750kN。某柱下原设计布置A、B、C三桩，工程桩施工完毕后，检测发现B桩有严重缺陷，按废桩处理（桩顶与始终保持脱开状态），需要补打D桩，补桩后的桩基，如图所示。高度为1100mm，混凝土强度等级为C35（fT=1.57N／mm2），柱截面尺寸为600mm×600mm。取的有效高度h0=1050mm。按《建筑桩基技术规范》作答。 假定，柱只受轴心荷载作用，相应于荷载的标准组合时，原设计单桩承担的竖向压力均为745kN，假定尺寸变化引起的及其上覆土重量和基底竖向力合力作用点的变化可忽略不计。补桩后此三桩下单桩承担的最大竖向压力值（kN）最接近下列（）项。（）
A.
750
B.
790
C.
850
D.
900
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相关题目：
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3DES is muchmore secure than DES.
B.
Both DES and 3DES are stream ciphers.
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DES uses 64 bitkeys， although the effective key lengthis only 56bits.
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The decryption operation for both DES and 3DES is the same as the encryption operation.
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DES can only be used for encryption， whereas 3DES can also be used for authentication.
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