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单选题
243、外径必须与内径同轴。
A
The exterior radius must be installed on a common shaft with the interior radius.
B
The external diameter must be concentric to the internal diameter.
C
The outer radius and the inner radius must be suitable.
答案解析
正确答案：A
解析：
解析:注释: exterior 外部 ; interior 内部。radius 半径; diameter 直径 concentric 同心的;suitable 合适的。
相关知识点：
外径内径须同轴安装
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