传真用纸—热敏纸字迹的色素及与纸张结合方式是什么﹖
参考答案：
染料，吸收式的，热敏纸不耐久。
工商行政管理的目标就是建立和维护社会主义()。
A.市场经济规模
B.自由经济秩序
C.计划经济体系
D.市场经济秩序
They _______ on the program for almost one week before I joined them, and now we ________ it as no good results have come out so far.
A．had been working; are still working
B．had worked; were still working
C．have been working; have worked
D．have worked; are still working
