在计算投资时不能某一方案只计算固定资产投资,另一方案只计算流动资金体现了可比性原则的()方面。
A.满足需要可比
B.消耗费用可比
C.价格指标可比
D.时间因素可比
参考答案:B
—I ______ for you for two hours, but in vain. Where did you go?
—I ______ at my uncle’s.
A.had looked; may have stayed
B.looked; must have stayed
C.have looked; may be staying
D.looked; must be staying
已知|a|=2,且a·b=2,则|a×b|=()。
A.A
B.B
C.C
D.D