纬线的形状经线的形状纬线是否都等长经线是否都等长北纬用什么符_爱下问搜题

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问题填空题

纬线的形状
经线的形状
纬线是否都等长
经线是否都等长
北纬用什么符号表示
南纬用什么符号表示
北纬，南纬的分界线是
东经用什么符号表示
西经用什么符号表示
东经，西经的分界线是

答案

（1）在地球仪表面，与地轴垂直并环绕地球一周的圆圈叫纬线圈．赤道是最大的纬线圈，把地球平分为南、北两个半球，从赤道向两极，纬线逐渐缩短，到两极缩为一点．纬线指示东西方向；

（2）人们为了区别各条纬线，分别为它们标定了度数，这就是纬度．赤道的纬度为0°．赤道以北称北纬，赤道以南称南纬，北纬和南纬各有90°．北极和南极分别是北纬90°（写作90°N）和南纬（写作90°S）；

（3）在地球仪表面，连接南、北两极并垂直于纬线的弧线，叫经线．经线指示南北方向．各条经线的长度相等；

（4）1884年国际经度会议决定，以通过英国格林尼治天文台旧址的经线，作为经度的起始线，即0°经线，或称本初子午线．从这条经线向东为东经，用符号“E”表示，向西为西经，用符号“W”表示．

故答案为：

纬线的形状	圆圈
经线的形状	半圆
纬线是否都等长	不是
经线是否都等长	是
北纬用什么符号表示	N
南纬用什么符号表示	S
北纬，南纬的分界线是	赤道
东经用什么符号表示	E
西经用什么符号表示	W
东经，西经的分界线是	本初子午线

完形填空

阅读下面短文，从短文后各题所给的四个选项（A、Ｂ、Ｃ和Ｄ）中，选出可以填入空白处的最佳选项，并在答题卡上将该选项涂黑。
I still remember my first job in the city center. The        was large, dark and old        the physics lecture room was on the second floor.        , it wasn’t a lecture room at all, it was an ordinary room, but it had “LECTURE ROOM’ on the       . The students were sixteen or seventeen years old,        several years younger than me.       , some of them looked and acted       older than me sometimes.
The room was directly       the street, and had the window looking out over the street and many houses. One day, I was       some words on the blackboard when I heard a sudden change in the noise behind me. There was a man standing in the room with       an apple in his hand. He looked      .
“Who threw this?” he asked, looking round the class.
“I beg your pardon? What is the matter?” I said. “     threw this apple out of the window,” he said. “It       on my car.”
“Who threw an apple out of the window?” I       to the class. There was no answer.
“I       the fellow who threw this.” said the man. “I will be       outside for you.” And then he left, closing the door behind him.
     was silence and I continued with the lesson. At the end of every lesson, usually the class were all       before the bell finished ringing, leaving me saying “That’s all for today” to an empty    . This time, when the bell went for the end of the lesson, no one      . “That’s all for today,” I said. “You go first, sir,” said one of the boys. It made a nice change, I being out first.

D．As a result

问答题简答题

安健环管理体系的理念是什么？