[判断题]一只火灾探测器能有效探测的单向最大水平距离,称为火灾探测器保护半径。
A.正确
B.错误

A teacher is someone who communicates information or skill so that someone else may learn. Parents are the (51) teachers. Just by living with their child and (52) their everyday activities with him, they teach him their language, their values and their manners. Information and skills difficult or teach (53) family living are taught in a school by a person (54) special occupation is teaching.
Before 1900 it (55) widely assumed that a man was qualified to teach if he could read and write-and (56) qualified if he knew arithmetic. With modest (57) like these, it is no (58) that teachers had low salaries and little prestige. Literature and history frequently portray teacher (59) fools and ignoramuses.
By the late 19th century, there were (60) that the starts of teachers was slowly (61) Great educators such as Mann and Henry Barnard, and innovative thinkers such as Dewey a

某水闸共10孔，每孔净宽10.0m。底板厚1.6m，闸室总宽112.8m，顺水流长16.Om；闸室及翼墙底板基础采用水泥土搅拌桩处理。其主要工程内容有：①地基与基础；②闸室段（土建）；③上游连接段；④下游连接段；⑤消能防冲段；⑥交通桥（工作桥）；⑦金属结构及启闭机安装；⑧启闭机房和桥头堡。施工过程中，发生如下事件：
事件1：水泥土搅拌桩在施工前进行了2根工艺性试验桩，确定了施工参数。
事件2：水泥土搅拌桩施工完成后，施工单位对基坑进行了开挖，按规范要求对水泥土搅拌桩进行了检测。检测合格后，施工单位组织项目法人、监理、设计、质量监督、运行管理等单位组成联合小组，共同检查核定其质量等级并填写签证表。
事件3：水闸闸墩施工正值高温季节，为此，施工单位采取了多项温控措施保证混凝土施工质量。
事件4：本工程共划分为1个单位工程。单位工程完成后，监理单位组织项目法人、设计、施工、运行管理、质量监督等单位组成外观质量评定小组，现场进行工程外观质量检验评定，并将评定结论报工程质量监督机构核备。