施工企业在签订建造（施工）合同时发生的差旅费应计入（）。
A．生产成本
B．期间费用
C．直接费用
D．间接费用
参考答案：B
x + y >2”是“x >1且y >1”的
A．充分不必要条件
B．必要不充分条件
C．充要条件
D．既不充分也不必要条件
I wrote a letter to John for his help during my high school years. without which I the college entrance exam.
A． would fail
B．would have failed
C．should fail
D．must have failed
