There are basic guidelines to bear in mind. First, don't use as a password your name or that of a member of your family, even in modified form. Also avoid use of your telephone number, your Social Security number, or your address. Such information can easily be obtained by a determined hacker (黑客).
In addition, if possible, don't use passwords made up entirely of letters or digits. A relatively simple computer program can crack such a code quickly: Finally, do not use a word that can be found in any dictionary, even a foreign-language one. Huge lists are available that contain words, place names, and proper names from all languages. Programs can test for variations of these words, such as if they are spelled backward, capitalized, or combined.
So, what kinds of passwords should be used? Usually ones that have a minimum of six to eight characters and that have a mixture of upper-and lower-case letters, digits, and punctuation (标点) symbols. How difficult is it to crack such a combination of characters? One source says that "a machine that could try one million passwords per second would require, on the average, over one hundred years."
How can you choose a combination that is easy to remember? Some suggest that you take the title of a favorite book or film or a line from a song or poem and use the first latter from each word as your password, adding capital letters, punctuation, or other characters. For example, "to be or not to be" could become "2B/not2B".
Other suggestions include taking two short words and link them with a punctuation character, such as "High?Bug" or "Song; Tree".
Taking into account the suggestions outlined above can help you to protect important information from unwanted hackers. Remember, too, the importance of changing your passwords regularly. Just a final comment, whatever passwords you decide to use, don't pick any of the examples given above.
What is the main idea of this passage?
A.How to strengthen security through a password.
B.How to choose a password that is easy to remember.
C.How to prevent your password from being cracked.
D.How to choose a safe and convenient password.
第1题
均相酶免疫测定的基本特征是
A、反应属非竞争结合,测定灵敏度较高
B、反应平衡后,抗原抗体复合物中的酶活性会发生变化
C、酶标抗原与抗体在固相介质表面形成复合物后,作用于底物成色
D、由于勿需分离B、F即可确定待测物含量,表明其不易受内源性酶的干扰
E、主要用于抗原大分子的检测
第2题
A.分为均相酶免疫测定和异相酶免疫测定
B.分为均相酶免疫测定和固相酶免疫测定
C.分为非均相酶免疫测定和固相酶免疫测定
D.分为固相酶免疫测定和液相酶免疫测定
E.分为均相酶免疫测定和液相酶免疫测定
第3题
A.分为均相酶免疫测定和异相酶免疫测定
B.分为均相酶免疫测定和固相酶免疫测定
C.分为非均相酶免疫测定和固相酶免疫测定
D.分为固相酶免疫测定和液相酶免疫测定
E.分为均相酶免疫测定和液相酶免疫测定
第4题
A.分为均相酶免疫测定和异相酶免疫测定
B.分为均相酶免疫测定和固相酶免疫测定
C.分为非均相酶免疫测定和固相酶免疫测定
D.分为固相酶免疫测定和液相酶免疫测定
E.分为均相酶免疫测定和液相酶免疫测定
第5题
A.分为均相酶免疫测定和异相酶免疫测定
B.分为均相酶免疫测定和固相酶免疫测定
C.分为非均相酶免疫测定和固相酶免疫测定
D.分为固相酶免疫测定和液相酶免疫测定
E.分为均相酶免疫测定和液相酶免疫测定
第6题
以下对酶免疫测定的分类中,正确的是
A.分为均相酶免疫测定和异相酶免疫测定
B.分为均相酶免疫测定和固相酶免疫测定
C.分为非均相酶免疫测定和固相酶免疫测定
D.分为固相酶免疫测定和液相酶免疫测定
E.分为均相酶免疫测定和液相酶免疫测定
第7题
A.分为均相酶免疫测定和异相酶免疫测定
B.分为均相酶免疫测定和固相酶免疫测定
C.分为非均相酶免疫测定和固相酶免疫测定
D.分为固相酶免疫测定和液相酶免疫测定
E.分为均相酶免疫测定和液相酶免疫测定
第8题
A.反应平衡后,抗原抗体复合物中酶活性会发生变化
B.酶标抗原与抗体在固相介质表面形成复合物后,作用于底物成色
C.不用分离B、F即可确定待测物质的含量,表明其反应不易受内源性酶的干扰
D.反应属于非竞争结合,测定的灵敏度较高
E.测定方法较为复杂,且不易用于自动化检测
第9题
A.反应平衡后,抗原抗体复合物中酶活性会发生变化
B.酶标抗原与抗体在固相介质表面形成复合物后,作用于底物成色
C.不用分离B、F即可确定待测物质的含量,表明其反应不易受内源性酶的干扰
D.反应属于非竞争结合,测定的灵敏度较高
E.测定方法较为复杂,且不易用于自动化检测
第10题
以下对酶免疫测定的分类中,正确的是
A.分为均相酶免疫测定和异相酶免疫测定
B.分为均相酶免疫测定和固相酶免疫测定
C.分为非均相酶免疫测定和固相酶免疫测定
D.分为固相酶免疫测定和液相酶免疫测定
E.分为均相酶免疫测定和液相酶免疫测定
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