28 The reason that cost management is so difficult in project management is that:
A. Projects by definition and nature are non-recurring events and are therefore difficult to predict.
B .There are no tools for identifying project tasks.
C. Project managers do not care about tracking costs, as only schedules are important to all project managers.
D. A and B only
E. B and C only
第1题：
Project (75)．Management：includes the processes required to ensure that the project includes au the word required, and only the work required, to complete the project successfully．
A．Integration
B．Configuration
C．Scope
D．Requirement
第2题：
A.Control
B.Supervisor
C.Packet
D.Management
第3题：
（1）创建一个新的项目“customer_management”。
（2）在新建立的项目“customer_management”中创建数据库“order_management”。
（3）在数据库“order_management”中建立表“order_list”，表名称分别为：“客户型”、“订单号”、“订购日期”和“总金额”；类型分别为：“字符型（6）”、“字符型（6）”、“日期型”和“浮动型”。
（4）为“order list”表创建一个主索引，索引名和索引表达式均是“订单号”。
第4题：
材料：
It is not recommended that any person shall be allowed on the bridge or in the pilot house except the pilot and other representative of the canal，and master and such officers and other members of the crew of the vessel as may be necessary for its navigation and control，management，operation and safety．
Navigational aids are difficult to maintain and are reported to be unreliable in this waters．A considerable amount of shipping uses the canal and，in addition，many local fishing craft with nets may be encountered in the area. Since passage through the canal entails a run of more than 250 miles，long periods of considerable vigilance are necessary in order to maintain safe standards of navigation．
问题：
PILOT HOUSE is referred to ________ in this passage．
A.the cabin in which the pilot stays
B.the space which the rudder is located
C.the bridge of vessels
D.the cabin which is prepared for the pilot
SHIPPING is referred ________ in this passage．A.the operations of transportation of GOODs by sea
B.the procedures of marine transportation business
C.the management of marine transportation business
D.the vessels and ships
The person on the bridge or in the pilot house shall be those ________．A.who are recommended
B.who are familiar with the navigation．management．Operation and safety control
C.who are directly involved in the navigation，management，operation and safety control
D.who have nothing to do with the navigation，management，operation and safety control
The author implies that ________．A.even by making use of modern instrument it is difficult to maintain safety in this area
B.mariners should take it easy when navigating in this area
C.modern instrument should be used to control the safety of navigation in this area
D.it is dangerous when navigating in this area
请帮忙给出每个问题的正确答案和分析，谢谢！
第5题：
A. All VLANs except the default VLAN will be removed from all switches.
B. All existing switches will have the students, admin, faculty, Servers, Management,Production, and no-where VLANs.
C. The VLANs Servers, Management, Production, and no-where will replace the VLANs on SwX.
D. The VLANs Servers, Management, Production, and no-where will be removed from existing switches.
第6题：
A.unifiedwirelessandwiredinfrastructureforasinglepointofcontrolforallWLANtraffic
B.simplifiedmanagementofcentralorremotelylocatedaccesspoints
C.extensionfeaturestowirednetworkservices，suchasdenialofservicepreventionandACLs
D.threatdefensewitharobustwiredIDS
第7题：
A.unifiedwirelessandwiredinfrastructureforasinglepointofcontrolforallWLANtraffic
B.simplifiedmanagementofcentralorremotelylocatedaccesspoints
C.extensionfeaturestowirednetworkservices，suchasdenialofservicepreventionandACLs
D.threatdefensewitharobustwiredIDS
第8题：
A.security
B.functional
C.junos-global
D.management
第9题：
材料：Navigation in the canal
It is not recommended that any person shall be allowed on the bridge or in the pilot house except the pilot and other representative of the Canal，and Master and such officers and other members of the crew of the vessel as may be necessary for its navigation and control，management，operation and safety．
Navigational aids are difficult to maintain and are reported to be unreliable in this waters．A considerable amount of shipping uses the canal and，in addition，many local fishing craft with nets may be encountered in the area.Since passage through the canal entails a run of more than 250 miles，long periods of considerable vigilance are necessary in order to maintain safe standards of navigation．
问题：PILOT HOUSE is referred to ______ in this passage．
A.the cabin in which the pilot stays
B.the space in which the rudder is located
C.the bridge of vessels
D.the cabin which is prepared for the pilot
SHIPPING is referred to ______ in this passage．A.he operations of transportation of goods by sea
B.the procedures of marine transportation business
C.the management of marine transportation business
D.the vessels and ships
The author implies that ______ ．A.even by making use of modern instrument it is difficult to maintain safety in this area
B.mariners should take it easy when navigating in this area
C.modern instrument should be used to control the safety of navigation in this area
D.it is dangerous when navigating in this area
The person on the bridge or in the pilot house shall be those ______ ．A.who are recommended
B.who are familiar with the navigation，management，operation and safety control
C.who are directly involved in the navigation，management，operation and safety control
D.who have nothing to do with the navigation，management，operation and safety control
请帮忙给出每个问题的正确答案和分析，谢谢！
第10题：