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在什么情况下对触电伤员用心肺复苏法救治其三项本措施是什么？
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一般净化空调系统，配置空气过滤器为粗效过滤器、中效过滤器(或高中效过滤器)、末级过滤器(亚高效或高效过滤器)。中效过滤器或高中效过滤器宜集中设置在_______。
北京地区某洁净室面积为250m2，层高3．0m；室内参数要求：t=(2±21)℃，φ=(50±5)％，洁净度等级[N]7级，室内热负荷60kW，人很少，ε→+∞，室内空气露点温度t1=12℃，送风温度t0=14℃，洁净室的送风量为________m3／h。
建筑高度超过100m的建筑，宜采用________供水方式。
(教材课文原文)
{A. By; B. In; C. Until} 2050, the world's population {A. projected; B. is projected; C. has been projected} to rise to 9 billion from just over 7 billion currently. Proponents of genetically modified foods say they are safe and can boost harvests {A. even though; B. even; C. though} in bad conditions by protecting against pests, weeds and drought. This, they argue, will be essential to meeting the needs of a booming population in decades to come and avoiding starvation.
{A. Furthermore; B. Moreover; C. However} Doug Gurian-Sherman, senior scientist for the food and environment program at the Union of Concerned Scientists, an advocacy group, said genetic engineering for insect resistance has provided only a modest increase in yields since the 1990s and drought-resistant strains have only {A. modestly; B. modest; C. moderate} reduced losses from drought.
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