AutoCAD可以进行三维实体造型。
参考答案：对
—Jackie Chan has donated dollars to charity.
—He is an example to us all.
A．thousand
B．thousands
C．thousand of
D．thousands of
拆卸（）的机件，应有安全防护措施。
A.有弹性
B.偏重
C.易滚动
D.有轴承
