海船船员考试
单选题Which of the following statements is true concerning all three-phase alternators?（）A Each has three separate but identical armature windings acted on by one system of rotating magnetsB Each has one armature winding acted on by three identical but separ
题目
Each has three separate but identical armature windings acted on by one system of rotating magnets
Each has one armature winding acted on by three identical but separate systems of rotating magnets
All three-phase alternators are designed to operate with a O8 leading power factor
The three phases always provide power to the load through three sets of slip rings and brushes
相似问题和答案
第1题：
Which of the following statements is NOT true?
A．Qigong can cure some patients miles away．
B．Qigong can travel the oceans．
C．Qigong alter the course of ballistic missiles．
D．All of the above．
参见文章第二自然段A、B、C都是作者道听途说，但作者并不赞成此观点，所以D正确。
第2题：
Which of the following is true concerning Frame Relay multipoint subinterfaces?（）
- A、An IP address is required on the physical interface of the central router.
- B、All routers are required to be fully meshed.
- C、All routers must be in the same subnet to forward routing updates and broadcasts.
- D、Multipoint is the default configuration for Frame Relay subinterfaces.
正确答案:C
第3题：
Which of the following statements is true? Accounts payable are ______.
A．debts owed to suppliers
B．related to purchases of goods on an open account
C．current liabilities
D．all of the above
解析：文章第三段提到Accounts payable are debts...on an open account.本题是关于应付账款的表述，应付账款是企业欠供应商的债务，是由于购买商品时进行赊销而形成的应付账款，应付账款属于短期流动债务。
第4题：
The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command（）。
- A、This command should be executed from the global configuration mode
- B、The IP address 10.121.16.8 is the local router port used to forward data
- C、102 is the remote DLCI that will receive the information
- D、This command is required for all Frame Relay configurations
- E、The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC
正确答案:E
第5题：
Which statements concerning the value of a member variable are true， when no explicit assignments have been made？（）
- A、The value of an int is undetermined.
- B、The value of all numeric types is zero.
- C、The compiler may issue an error if the variable is used before it is initialized.
- D、The value of a String variable is "" （empty string）.
- E、The value of all object variables is null.
正确答案:B,E
第6题：
Which statements concerning the switch construct are true？（）
- A、All switch statements must have a default label.
- B、There must be exactly one label for each code segment in a switch statement.
- C、The keyword continue can never occur within the body of a switch statement.
- D、No case label may follow a default label within a single switch statement.
- E、A character literal can be used as a value for a case label.
正确答案:E
第7题：
The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command？（）
- A、This command should be executed from the global configuration mode.
- B、The IP address 10.121.16.8 is the local router port used to forward data.
- C、102 is the remote DLCI that will receive the information.
- D、This command is required for all Frame Relay configurations.
- E、The broadcast option allows packets， such as RIP updates， to be forwarded across the PVC
正确答案:E
第8题：
A language change is inevitable
B language change is abrupt
C language change is universal
D language change is extensive
第9题：
Which statements are true concerning NAT？ （）
- A、 NAT provides 1 to manyaddress mapping.
- B、 NAT provides 1 to 1 address mapping.
- C、 NAT is only useful forTCP/UDP and ICMP traffic.
- D、 NAT can be used for all IP traffic.
正确答案:B,D
第10题：
Which of these statements concerning the collection interfaces are true？（）
- A、Set extends Collection.
- B、All methods defined in Set are also defined in Collection.
- C、List extends Collection.
- D、All methods defined in List are also defined in Collection.
- E、Map extends Collection.
正确答案:A,B,C