---So I’m going to make the desk myself.

---Why ____ instead, if I may ask?

A．not buy it

B．don’t buy one

C．not buy one

D．don’t buy it

滑移法竖立桅杆和拆除桅杆作业要点是：控制好桅杆底部，不得有横向摆动或过大的水平推力，以确保安全平稳的竖立或拆除桅杆。