办公自动化系统的四大支柱是计算机技术、通信技术、系统科学和 ______。
参考答案：行为科学
____was known to us all that Johnson had broken his promise____he would give each of us a small gift.
A．As; which
B．What; that
C．It; that
D．It; which
龙胆、防风、白薇、丹参等药材净选加工时应除去（）
A.去残茎
B.去皮壳
C.去心
D.去核
E.去芦
