皮皮学,免费搜题
登录
logo - 刷刷题
搜题
【简答题】
构成艺术传播的五个要素是艺术传播主体、艺术传播内容、 、 受传者 、传播效果。
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案:
举一反三
【多选题】保护接地和保护接零相比较有哪些不同之处 ()
A.
保护原理不同。低压系统保护接地的基本原理是限制漏电设备对地电压,使其不超过某一安全围高压系统的保护接地,除限制对地电压外,在某些情况下,还有促成系统中保护装置动作的作用。保护接零的主要作用是借接零线路使设备潜心电形成单相短路,促使线路上保护装置迅速动作。
B.
适用范围不同。保护接地适用于一般的低压不接地电网及采取其它安全措施的低压接地电网;保护接地也能用于高压不接地电网。不接地电网不必采用保护接零。
C.
线路结构不同。保护接地系统除相线外,只有保护地线。保护接零系统除相线外,必须有零线;必要时,保护零线要与工作零线分开;其重要地装置也应有地线。
D.
以上说法都不对
【单选题】( )She didn ’ t notice me come in and went on ________ her newspaper.
A.
read
B.
to read
C.
reading
D.
with reading
【简答题】配额抽样是一种概率抽样方法。
【多选题】保护接地和保护接零相比较有哪些不同之处?
A.
保护原理不同
B.
适用范围不同
C.
线路结构不同
D.
保护电压不同
【多选题】Part II Reading Comprehension (2*20=40 points) Passage 1 The following are the story of Mary. Put A-E in the correct order .(2*5=10points) 下面是有关于 Mary 的故事,读内容,将 A-E 排序。 Mary had a really busy weekend...
A.
On Saturday morning, she played the piano.
B.
In the evening she went shopping with her mom.
C.
Mary felt a little bit tired and went to bed early on Sunday evening.
D.
Mary helped mom to do some cleaning on Sunday afternoon.
E.
She went to library with her friends on Sunday morning. 21 → 22 → 23 → 24 → 25
【简答题】B Harry Potter lovers around the world may want to thank Alice Newton. She was eight years old when her father brought home a manuscript for her to read. At the time, she was working for Bloomsbury Pu...
【单选题】She went on reading _____ it was midnight.
A.
as
B.
for
C.
until
D.
lest
【简答题】保护接地和保护接零相比较有哪些不同之处?
【简答题】根据以下提供的信息,填写Jessica的周末活动安排表。 Jessica had a busy weekend. She got up at 6:00 on Saturday morning. She had breadfast at 7:00. Then she borrowed some books from the library. In the afternoon, she played ...
【简答题】Fill in the blanks with proper words. murmur grunt mumble whisper mutter The man could only __________ an apology for the mistake he made. The child ____________ something in its sleep. He j...
相关题目:
参考解析:
知识点:
题目纠错 0
发布
创建自己的小题库 - 刷刷题