一项工作,甲单独做要4天,乙单独做要6天,甲乙合作5天完成.______.
1÷(14+16),
=1÷512,
=125(天);
125≠5;
故答案为:错误.
His efforts to raise money for his program were ________ because no one showed any intention to take
a cent out of their pockets.[ ]
A.in place
B.in sight
C.in effect
D.in vain
比较诗学研究的内容有哪些?