七七事变后,国共两党第二次合作建立的统一战线是[ ]
A.革命统一战线
B.人民民主战线
C.爱国统一战线
D.抗日民族统一战线
答案:D
分泌白介素-1的主体细胞是被哪种细胞激活的()
A.B淋巴细胞
B.T淋巴细胞
C.粒细胞
D.大吞噬细胞
E.肥大细胞
In relation to partnership law, explain the requirement that the business of the partnership must be carried on for the joint benefit of all the partners. (10 marks)