定本
参考答案：
书籍经过校勘，分别异同，判断是非，然后将自己认为正确的文字记录下来，即成定本。凡重新整理编排的文献常采用定本形式。
A warehouse had a square floor with area 10,000 square meters. A rectangular addition was built along one entire side of the warehouse that increased the floor area by on-half as much as the original floor are-a. How many meters did the addition extend beyond the original building ？（）
A．10
B．20
C．50
D．200
E．500
汽车（）不得装用翻新的轮胎。
A.后轮
B.转向轮
C.驱动轮
