单项选择题

采用网喷混凝土加固基坑壁，喷射前应定距离埋设钢筋，以（）的长度作为喷射厚度的标志。

A．露出岩面
B．风化基岩
C．稳定层
D．放坡高程

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单项选择题

根据下列文章，回答36～40题。
It never rains but it pours. Just as bosses andboards have finally sorted out their worst accounting and compliance troubles，and improved their feeble corporation governance， a new problem threatens toearn them- especially in America-the sort of nasty headlines that inevitablylead to heads rolling in the executive suite： data insecurity. Left， until now，to odd， low-level IT staff to put right， and seen as a concern only of data-richindustries such as banking， telecoms and air travel， information protection isnow high on the boss's agenda in businesses of every variety.
Several massive leakages of customer and employee data this year- fromorganizations as diverse as Time Warner， the American defense contractor ScienceApplications International Corp and even the University of California.Berkeley-have left managers hurriedly peering into their intricate 11 systemsand business processes in search of potential vulnerabilities.
“Data is becoming an asset which needs no be guarded as much as any otherasset.” says I am Mendelson of Stanford University's business school “Theability guard customer data is the key to market value， which the board isresponsible for on behalf of shareholders” Indeed， just as there is the conceptof Generally Accepted Accounting Principles （GAAP）. perhaps it is time for GASP.Generally Accepted Security Practices， suggested Eli Noam of New York's ColumbiaBusiness School. “Setting the proper investment level for security， redundancy，and recovery is a management issue， not a technical one.” he says.
The mystery is that this should come as a surprise to any boss. Surely itshould be obvious to the dimmest exccutive that trust， that most valuable ofeconomic assets， is easily destroyed and hugely expensive to restore-and thatfew things are more likely to destroy trust than a company letting sensitivepersonal data get into the wrong hands.
The current state of affairs may have been encouraged-though notjustified-by the lack of legal penalty （in America， but not Europe） for dataleakage. Until California recently passed a law. American firms did not have totell anyone， even the victim， when data went astray， I hat may change fast lotsof proposed data-security legislation now doing the rounds in Washington. D．C．Meanwhile. the theft of information about some 40 million credit-card accountsin America， disclosed on June 17th. overshadowed a hugely important decision aday earlier by America's Federal Trade Commission （FTC） that puts corporateAmerica on notice that regulators will act if firms fail to provide adequatedata security.
第 36 题 The statement： “It never rainsbut it pours” is used to introduce
A．the fierce businesscompetition.
B．the feeble boss-board relations
C．the threat fromnews reports.
D．the severity of data leakage.

A.Berkeley-have
B.”
C.Generally
D.”
E.C．Meanwhile.
F.the
G.
B．the
H.the
I.the

单项选择题

【案例分析题】
某桥梁工程，承包商在桥梁基坑施工的具体方法：①基坑开挖采用网喷混凝土加固坑壁进行施工。②对围堰的施工采用土袋围堰施工。③地基加固时，采用钢筋混凝土短桩将基坑范围内的地基土挤密，使地基土与桩体形成复合地易达到地基加固的目的。在施工过程中，发现围堰结构不稳固，需要更正围堰施工方案，对围堰进行了严格的施工。
当采用机械挖掘时，应视机械的种类确定，但堰顶宽度不宜小于（）。

A．1m
B．3m
C．5m
D．10m