Point C is the center of the hollow sphere of which the mirror is a part.
举一反三
- Which part of the United States was attacked by snowstorm A: The north-eastern part. B: The south-eastern part. C: The north-western part.
- Which part of the United States was attacked by snowstorm A: The north-eastern part. B: The south-eastern part. C: The north-western part. D: The south-western part.
- ______ rotate in a counter- clockwise direction （逆时针方向）around the “eye,” which is the center of the storm and the calmest part.
- The cylinders and pistons are in the ______ the cylinder block and the crankshaft is in the lower part. A: left part of B: upper part of C: right part of D: bottom part of
- 《几何原本》中,（）是其第三条定义。 A: A line is breadthless length. B: A point is that which has no part. C: A straight line is a line which lies evenly with the points on itself. D: The ends of a line are points.