数据词典中有哪几种类型的条目?
参考答案:
— Hi, Henry, I’m going to China for my holiday.
— China? It is a country which is well worth .
A.to visit
B.visiting
C.to be visited
D.being visited
铣削平面轮廓曲线工件时,铣刀半径应()工件轮廓的()凹圆半径。