反映企业经营成果的会计要素是()。
A．收入、费用和利润
B．资产、负债和所有者权益
C．收入、资产和负债
D．资产、负债和利润
参考答案：A
The students _ their homework every day. Now they _ their homework. [ ]
A. do; do
B. does; doing
C. doing; are doing
D. do; are doing
定位基准、测量基准和装配基准______基准。
A．都是工艺
B．都是设计
C．既是设计基准，又是工艺基准
