用益物权的行使以占有标的物为前提，如不占有标的物即无法对标的物进行使用、收益，因而用益物权是对标的物的有形支配。
参考答案：对
– What a nice bicycle!
– Thanks. I ________ it for two months.
A. have bought B. bought C. have had
切削工艺对刀具材料的基本要求？
