Which of the following are key characteristics of PPP? (Choose three.)（）

A .  The equals（） method determines if reference values refer to the same object. B .  The == operator determines if the contents and type of two separate objects match. C .  The equals（） method returns true only when the contents of two objects match. D .  The class File overrides equals（） to return true if the contents and type of two separate objects  match.

A . Hierarchical OSPF networks need to be in one area B . Multiple OSPF areas must connect to area 0 C . Single area OSPF networks must be configured in area 1 D . Areas can be assigned any number from 0 to 63535 E . Area 0 is called the backbone area F . Each OSPF area need to be configured with a loopback interface

A . They increase the size of collision domains. B . They allow logical grouping of users by function. C . They can enhance network security, D . The increase the size of broadcast domains while decreasing the number of the broadcast domains. E . The increase the number of broadcast domains while decreasing the size of the broadcast domains. F . They simplify switch administration.

A . EIGRP advertises the best routes to its neighbor B . EIGRP uses "cost" to determine best path C . EIGRP allows unequal cost load balancing D . OSPF requires neighbor adjacencies before updates are sent E . EIGRP advertises all routes to its neighbor F . OSPF allows unequal cost load balancing

A . non-registered users B . stores C . organizations D . products E . access grou

A .  RC4 is a stream cipher B .  Stream ciphers require padding C .  AES is a block cipher D .  DES and 3DES are stream ciphers E .  AES is a stream cipher F .  AES， DES， and 3DES can be used as HMAC algorithm

<img src='https://img2.soutiyun.com/ask/uploadfile/2724001-2727000/a8578d301cbc3fdb6144aee3b6a5e1f3.gif' /> 此题为多项选择题。

A、Public speaking is just about selecting a topic, planning content, and speaking in public places. B、The most important element of public speaking is the speaker. C、We should be ethical speakers and never use public speaking to manipulate others. D、A good speaker never feels nervous before making a speech. E、Never record yourself or watch your video

A．Because coupon payments on municipal bonds are exempt from federal income tax, the expected after-tax return on them will be higher for individuals in higher income tax brackets． B．An increase in tax rates will increase the demand for municipal bonds, lowering their interest rates． C．Interest rates on municipal bonds will be lower than on comparable bonds without the tax exemption． D．All of the above are true statements． E．Only A and B are true statements．

A、Finance companies B、Mutual funds C、Pension funds D、All of the above E、Only A and B of the above

A、A. Tiger: 03:00 ~ 05:00 named Yinshi, when tigers hurt their prey more and show their ferocity. B、B. Ox: 01:00 ~ 03:00 named Choushi, when oxen begin to crush the food, regurgitating to the mouth slowly and comfortably. C、C. Dog: 19:00 ~ 21:00 named Xushi, when dogs begin to carry out their duty of guarding the houses. D、D. Pig: 23:00 ~ 1:00 named Haishi, when pigs are sleeping sweetly.