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(a) Level 3 qualified fire fighting facilities maintenance and testing institutions can engage in fire extinguisher inspection, maintenance, replacement of fire fighting agents and recovery activities authorized by production enterprises; The first-level qualification and the second-level qualification of fire fighting facilities maintenance and testing institutions can be engaged in building fire fighting facilities testing, repair and maintenance activities;小灰盯着河里的小主人，一直顺着河边跑。The answer downstairs was great, ~　　李双枪的质疑让李彪非常难堪，他知道李双枪的矛头对准的是自己，因为他和“林中王”林振海是异姓兄弟。为了哥哥，为了自己，李彪独闯林虎帮，讨回粮食，却意外发现自己与哥哥深爱着同一个人——白冬菊。Super factory viruses can exploit software vulnerabilities in the form of "zero-day vulnerabilities" (zero-day vulnerabilities are also called zero-time difference attacks, which refer to security vulnerabilities that are maliciously exploited immediately after being discovered). The virus will quietly infect a system, and the user does not need to do anything specially to make the virus worm take effect, such as accidentally downloading a malicious file. Moreover, it is not only spreading in Iran's nuclear system, this worm virus can spread through Windows systems all over the world. To some extent, this is because, in order to enter Iran's system, attackers infected computers outside Iran's network system with viruses (but these computers are believed to be connected to them), so that these computers can act as "carriers" of viruses.Complex version, work status.