单项选择题
Ever since Picasso’s paintings went on exhibit, there ____ large crowds at the museum every day.
A、have been
B、has been
C、is
D、are being
Ever since Picasso’s paintings went on exhibit, there ____ large crowds at the museum every day.
A、have been
B、has been
C、is
D、are being
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多项选择题
CAD的基本概念是
CAD的基本概念是
A.以计算机为辅助手段来完成产品设计的工作
B.以计算机为辅助手段来完成产品制造的工作
C.Computer Aided Design, 是一种手段,可以用软件实现
D.以计算机为辅助手段来完成产品制造管理的工作