彩色电视标准规定的三基色是（）。
A.红、绿、蓝
B.红、黄、绿
C.红、黄、蓝
D.青、红、黄
参考答案：A
1978年通过农村改革，将农村土地的集体经营制度改革为家庭承包经营制度。( )
A（）is a special type of parent company that exercises little operating control over the subsidiary，merely“holding”its stock as an investment.
A.Public company
B.holding company
C.firm
D.conglomerate
