甲、乙公司签订一份买卖合同。甲公司在合同约定的交货期前,有充分的证据证明乙公司经营状况严重恶化,甲公司有权解除合同。( )
参考答案:错
套期保值操作的原则包括()。
A.月份相同或相近原则
B.数量相等或相当原则
C.交易方向相反原则
D.种类相同或相关原则
They demanded that the library _____ open to students during the vacation.
A.should keep
B.was kept
C.would be kept
D.be kept