【简答题】试述“天赤道”和“天极”的概念

【单选题】过测者天底和两天极的半个大圆称为（）。

【单选题】赤道穿过的大洲中，面积最大的是[ ]

【单选题】磁赤道是指下列何者（）。

【判断题】天赤道与地平圈的交点是东点和西点。

【单选题】赤道是[ ]

【单选题】Passage 18 We all know that it is possible for ordinary people to make their homes on the equator (赤道), although often they may feel uncomfortably hot there. Millions do it. But as for t...

【单选题】Mars Global Surveyor is the oldest of five NASA robotic devices, which is designed to find out signs that Mars once had water;and it had been taking detailed pictures of the red planet for a decade. U...

【单选题】黄道与天赤道的交点为（ ）

【单选题】在真地平圈以上的天极称: