排管、电缆沟、电缆隧道的最小排水坡度分别为（）%。

[单选题]From childhood to old age, we all use language as a means of broadening our knowledge of ourselves and the world about us. When humans first 1 , they were like newborn children, unable to use this 2 tool. Yet once language developed, the possibilities for human kind’s future 3 and cultural growth increased. Many linguists believe that evolution is 4 for our ability to produce and use language. They 5 that our highly evolved brain provides us 6 an innate language ability not found in lower 7 . Proponents of this innateness theory say that our 8 for language is inborn, but that language itself develops gradually, 9 a function of the growth of the brain during childhood. Therefore there are critical 10 times for language development. Current 11 of innateness theory are mixed, however, evidence supporting the existence of some innate abilities is undeniable. 12 , more and more schools are discovering that foreign languages are best taught in 13 grades. Young children often can learn several languages by being 14 to them, while adults have a much harder time learning another language once the 15 of their first language have become firmly fixed. 16 some aspects of language are undeniably innate, language does not develop automatically in a vacuum. Children who have been 17 from other human beings do not possess language. This demonstrates that 18 with other human beings is necessary for proper language development. Some linguists believe that this is even more basic to human language 19 than any innate capacities. These theorists view language as imitative, learned behavior. 20 , children learn language from their parents by imitating them. Parents gradually shape their child's language skills by positively reinforcing precise imitations and negatively reinforcing imprecise ones. 请在13处填上正确答案（）

[判断题]因大风浪吹袭而打入海水时，应关严所有入口，如已有海水打入，则应尽快将海水排出艇筏之外，以保持艇筏内不受水浸。（）

[单选题]电视机着火不能用水或泡沫灭火器灭火的原因是（）

[单选题]畸形中央尖的临床表现不包括（　　）。

[多选题]实现B2B电子商务必须具备一定的基础，主要表现在：（　）

[单选题]建立电子通信网络通常是企业与（）沟通的方式。

[多选题]社会制度的功能有（）

[问答题]会计制度总体设计

[单选题]当声能衰减到原值的（　）所需的时间，称为混响时间。

[单选题]男，50岁，身高178cm，体重72kg，头痛、头晕、失眠、耳鸣、烦躁、精力不易集中并容易出现疲劳。有高血压家族史，临床检查发现：收缩压185mmHg，舒张压110mmHg，血清总胆固醇5．2mmol／L，而甘油三酯1．60mmol／L。饮食禁忌（）

[单选题]在电缆井、电缆隧道、电缆沟内工作时的安全措施错误的是（）。

[单选题]电缆沟、隧道、电缆竖井、电缆架及电缆线段等的巡查，至少每（）一次。

[判断题]电缆隧道和电缆沟内应采取有效的防水和排水措施，电缆隧道可根据需要采取通风措施。

[判断题]电缆隧道和电缆沟水平敷设时，要每隔一定距离设防火分隔，电缆竖井为防止火灾沿竖井迅速蔓延，应沿水平楼板方向做好防火分隔。

[单选题]排管、电缆沟、电缆隧道的最小排水坡度分别为（）%。

[填空题]作业过程中严禁抛物，传递工具材料时应使用（）并用绳索绑扎牢固，防止掉落伤人及掉落桥下，地面人员严禁（），在电缆沟盖板上行走时，要在两条电缆沟盖板的（）行走，施工...

[单选题]信号机械室、行车室内及站台上的电缆沟和盖板由（）维修，保证电缆沟、盖板的完好和正常使用。

[填空题]作业过程中严禁抛物，传递工具材料时应使用（）并用绳索绑扎牢固，防止掉落伤人及掉落桥下，地面人员严禁（），在电缆沟盖板上行走时，要在两条电缆沟盖板的（）行走，施工...

[单选题]信号机械室、行车室内及站台上的电缆沟和盖板由（）维修，保证电缆沟、盖板的完好和正常使用。

[名词解释题]电缆沟