作图题：画出轴的A-A和B-B移出剖面图，槽深4㎜，圆孔为通孔。
参考答案：
— _____ the team finished most of their research work?
—Yes, but the rest _____ rather difficult. [ ]
A. Has; are
B. Has; is
C. Have; are
D. Have; is
无息票据的贴现所得一定小于票据面值，而有息票据的贴现所得则不一定小于票据面值（）
