建筑施工图图样中的尺寸，以（）为单位时，一般不需标注单位。
A.mm或m
B.cm或mm
C.cm或m
D.dm或m
参考答案：A
当进行两个或多个资料变异程度的比较时，如果单位和（或）平均数不同时，需采用（）来比较。
A.方差
B.标准差
C.期望
D.变异系数
、To our great surprise, the disabled person made a requirement that he as a volunteer
A．received
B．was received
C．be received
D．would receive
