主页
学科
搜索
账户
常见问题
当前学科:电气工程师发输变电
题目:
单选题
人工接地网的外缘应闭合,外缘各角应做成圆弧形,圆弧的半径不宜小于均压带间距的一半。接地网内应敷设水平均压带。接地网的埋设深度不宜小于()m。
A
0.3
B
0.5
C
0.6
D
0.7
答案:
<查看本题扣1积分>
查看答案
答案不对?请尝试站内搜索
推荐知识点:
最为著名的“以山为陵”的有()。
Write down the numbers of the topic sentences in the following passages.①People who talk and sing to plants have no mental problems at all, according to an agricultural expert. ②“In fact, singing and talking to plants makes them grow better,” says Dr Braymar. ③The reason is quite simple. ④When we sing or talk to plants, we exhale(呼出) CO2 which plants need to survive (continue to live)and grow better. ⑤Plants absorb (take in) CO2 through their pores(小孔) during the sunlight hours and produce oxygen which people to survive. ⑥Singing and talking have good effect on plants, however, only during the daytime. ⑦Singing or talking at bedtime will not help plants to grow better or grow faster.
男性,27岁。双侧精索静脉曲张,左侧显著。术前精液常规检查提示弱精子症,术后精液质量显著改善。有关精索静脉曲张影响精液质量的因素,以下正确的是()。
我国信息安全管理的基本方针是()、分级管理、保障国家安全。
某产妇,自然分娩一女婴,产后阴道持续出血,胎儿娩出后24h出血量达800ml,检查子宫软,按摩后子宫变硬,阴道流血减少,该产妇诊断为产后出血。该产妇最不可能出现的护理问题是()。
“以形传神”、“传神写照”是中国画家( )提出来的。A.顾闳中B.阎立本C.顾恺之D.吴道子
应急预案在应急系统中起着关键作用,它明确了在突发事故发生之前、发生过程中,以及刚刚结束之后,谁负责做什么,何时做,相应的策略和资源准备等。()
汽车()主减速器多采用一对大小不等的锥齿轮传动机构。
根据水准点使用时间的长短及其重要性,将水准点分为()。