计算减法,不够减时应从前一位借1,在本位上加[ ]
A.1
B.10
C.2
答案:B
如图实验,放置1-2周时间后,装置中能出现的现象是:
A.试管中的液面上升
B.试管中的液面不变化
C.铁丝逐渐消失
D.铁丝不变化
In relation to the law of contract, explain when the default of the debtor will constitute a breach of contract. (10 marks)