给制室内质控图时，以最初的20个数据和3～5个月在控数据计算的累积平均值，作为质控品有效期内的（）.

A.暂定中心线

B.常规中心线

C.几何平均数

D.算术平均数

E.质控界限

A．( The committee voted against the proposed project

B．( The committee approved against the proposed project

C．( The committee considered the short report well written

D．( The committee was convinced by the documented report