2005年，长沙市评选了首批市级示范家长学校，请问，首批评选的市级示范家长学校有多少所？
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When fighting a fire on a bulkhead using a portable carbon dioxide extinguisher，the stream should be directed at the（）.
A. base of the flames，moving the horn from side to side，following the flames upward as they diminish
B. top of the flaming area，moving the horn from side to side，following the flames downward as they diminish
C. center of the flaming area，moving the horn vertically from top to bottom
D. bottom of the flaming area，moving the horn vertically to the top following the flames upward as they diminish
断路器交接试验，与灭弧室相通的气室SF6气体气体含水量（20℃的体积分数）应小于（）μL/L。
A. 100
B. 150
C. 200
D. 250
甲状腺亢进患者拔牙应将基础代谢率控制在___________以下，脉搏不超过___________次/分方可拔牙。
甲减的患者，注射TRH后，血清TSH不增高，提示为________，延迟增高为_______，过度反应为________。
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