Which of the following are true regarding a network using a subnet mask of 255.255.248.0?（）
A . It corresponds to a Class A address with 13 bits borrowed.
B . It corresponds to a Class B address with 4 bits borrowed.
C . The network address of the last subnet will have 248 in the 3rd octet.
D . The first 21 bits make the host portion of the address.
E . This subnet mask allows for 16 total subnets to be created.
F . The subnetwork numbers will be in multiples of 8.
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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.
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B . They allow logical grouping of users by function.
C . They can enhance network security,
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E . The increase the number of broadcast domains while decreasing the size of the broadcast domains.
F . They simplify switch administration.
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B . EIGRP uses "cost" to determine best path
C . EIGRP allows unequal cost load balancing
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E . EIGRP advertises all routes to its neighbor
F . OSPF allows unequal cost load balancing
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C . AES is a block cipher
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E . AES is a stream cipher
F . AES， DES， and 3DES can be used as HMAC algorithm
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<img src='https://img2.soutiyun.com/ask/uploadfile/2724001-2727000/a8578d301cbc3fdb6144aee3b6a5e1f3.gif' />
此题为多项选择题。
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Which of the following statements are wrong？
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
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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．
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A、Finance companies
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C、Pension funds
D、All of the above
E、Only A and B of the above
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Which of the followings are true？
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.
