某河道工程项目法人按照《水利水电工程标准施工招标文件》（2009年版）编制了施工招标文件，招标文件规定不允许联合体投标。某投标人递交的投标文件由投标函及附录、授权委托书（含法定代表人证明文件）、投标保证金、项目管理机构、施工组织设计、资格审查资料、拟分包情况表、已标价工程量清单组成。投标文件拟将渠道混凝土砌块衬砌项目分包，填报了拟分包情况表。
经评标委员会评审，该投标人中标，并签订合同。施工期第一个月完成的项目和工程量（或费用）如下：
（1）80m3<sup>3</sup>/h挖泥船施工，河道疏浚（5km，断面积48m2）；
（2）施工期自然回淤清除（断面积2m2）；
（3）河道疏浚超挖断面积（4m2）；
（4）排泥管安装拆除，费用10万元；
（5）开工展布，费用4万元；
（6）施工辅助工程，包括浚前扫床和障碍物清除及其他辅助工程，费用50万元。
渠道混凝土砌块衬砌项目分包中，拟分包人须提供的证明材料有哪些?
Application A holds an Update lock on a single row and application B is trying to read that row. If both applications are using isolation level UR, which of the following will occur?（） ["Application B will read the row.","Applications A and B will cause a deadlock situation.","Application B will wait until application A releases the Update lock.","Application A will be terminated so that application B can read the row."]
A customer has an existing IBM System Storage DS8700 2-way model with 8 mega packs of 300 GB disks and 16 fibre ports. How many additional fibre ports and mega packs can be installed in the base frame（） ["16fibre ports and 0 mega packs","4fibre ports and 8 mega packs","8fibre ports and 4 mega packs","12fibre ports and 0 mega pack"]
During which phase of the boot process is the rootvg volume group varied on and the root file system (hd4) checked?（） ["Boot phase 1","Boot phase 2","Boot phase 3","Boot phase 4"]
目前新建多层民用建筑一般选择（）作为排水管。 ["A.不锈钢管 ","B.镀锌管 ","C.PVC管 ","D.铸铁管"]
利用磷酸盐缓冲液或磷酸钙，为何能保持培养基pH值的稳定性？
