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甲到其住所地A县工商局申请公司设立登记，工商局工作人员乙要求其使用工商局统一格式的申请书，并向甲收取了合理的工本费用。后乙又告知甲材料不全，要求其修改并按照公示牌列表补交其他材料。甲认为乙是故意刁难，一气之下将公示牌踢坏。双方因此发生争执，A县公安局民警丙和丁赶到后，看到甲正在打乙，遂上前制止，但甲不听劝阻，丙和丁依法对甲使用警械，并强制带离。 下列关于派出所执法人员的行为，说法正确的是( )。
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社会的生命，无论是看纵剖面，是看横截面，都像一种有机的组织。从纵剖面看，社会的历史是不断的；前人影响后人，后人又影响更后人；没有我们的祖宗和那无数的古人，又那里有今日的我和你没有今日的我和你，又那里有将来的后人没有那无量数的个人，便没有历史，但是没有历史，那无数的个人也绝不是那个样子。由此可见( )
Scientists around the world are racing to learn how to rapidly diagnose，treat and stop the spread of a new，deadly disease．SARS—Severe Acute Respiratory Syndrome—was (1) for the first time in February 2003 in Hanoi， (2) since then has infected more than 1，600 people in 15 countries，killing 63．At this (3) ，there are more questions than answers surrounding the disease． Symptoms start (4) a fever over 100．4 degrees F，chills，headache or body (5) ．Within a week，the patient has a dry cough，which might (6) to shortness of breath．In 10% to 20% of cases，patients require (7) ventilation to breathe．About 3.5% die from the disease．Symptoms (8) begin in two to seven days，but some reports suggest it (9) take as long as 10 days．Scientists are close to (10) a lab test to diagnose SARS．In the meantime，it is diagnosed by its symptoms．There is no evidence (11) antibiotics or antiviral medicines help， (12) 至doctors can offer only supportive care．Patients with SARS arekept in isolation to reduce the risk of (13) ．Scientists aren’t sure yet，but some researchers think it’s a (14) discovered coronavirus，the family of viruses that cause some common colds． Most cases appear to have been passed (15) droplets expelled when infected patients cough or sneeze．Family members of infected people and medical workers who care (16) them have been most likely to (17) the illness．But recent developments in Hong Kong suggest that the (18) might spread through air，or that the virus might (19) for two to three hours on doorknobs or other (20) ．Health experts say it is unlikely，though，that sharing an elevator briefly with an infected person would be enough to pass the virus．
7辆车跑5趟能运280吨水泥。现在某工地需要水泥320吨，规定在4趟内运完，问需要增加同样型号的车子多少辆( )
在机床电气控制线路中，用于电动机短路保护的电器是热继电器。（ ）
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