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Charter Schools{{/B}} American public education has changed in recant years. One change is that increasing numbers of American parents and teachers are starting independent public schools{{U}} (51) {{/U}}charter schools (特许学校). In 1991, there were no charter schools in the United States. Today, more than 2,300 charter schools{{U}} (52) {{/U}}in 34 states and the District of Columbia. 575,000 students{{U}} (53) {{/U}}these schools. The students are from 5 years of age through 18 or older. A charter school is{{U}} (54) {{/U}}by groups of parents, teachers and community (社区) members. It is similar in some ways{{U}} (55) {{/U}}a traditional public school. It receives tax money to operate just as other public school A. treated B. needed C. earned D. wasted [单项选择]港作拖轮的使用方式主要有（）.
A. CPP、ZP、VPS B. 吊拖、横拖、倒拖 C. 顶推、傍拖、吊拖、作舵船用及组合拖带 D. 固定螺旋桨式、可变螺距加导管式、平旋推进器 [单选题]钳型电流表主要用于测量()。
A.极小电流 B.一般电流 C.较大电流 D.极大电流 [单项选择]以下关于优先级比较，叙述正确的是______.
A. 算术运算符＞逻辑运算符＞关系运算符 B. 逻辑运算符＞关系运算符＞算术运算符 C. 算术运算符＞关系运算符＞逻辑运算符 D. 以上均不正确 [单选题]武汉钢铁有限公司能环部热力分厂烟气净化热能电站通常连续运行（ ）小时后应做一次危急保安器动作试验
A.24 B.2000 C.168 D.365 [单项选择]对水源选择进行环境卫生监督属（）
A. 经常性卫生监督 B. 预防性卫生监督 C. 环境监督 D. 环境监测 E. 环境调查 [单项选择]人体最主要的氟来源是
A. 饮水 B. 食物 C. 空气 D. 氟化牙膏 E. 含氟维生素 [判断题]县级以上地方各级人民政府有关部门依照本法和其他有关法律、法规的规定，在各自的职责范围内对有关行业、领域的安全生产工作实施综合监督管理。（ ）
A.正确 B.错误 我来回答: 提交
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