【多选题】关于表面波
A.
介质表面受到交变应力,产生沿介质表面传播的波
E.
表面波只能检测距离工件表面两倍波长深度内的缺陷
【判断题】'Transformation rules don't have to follow a set order.()
【判断题】溢价购人的债券在当期计提利息和摊销溢价金额时,应按应计利息减摊销的溢价金额后的差额计人投资收益。()
【单选题】She wasn’t allowed into the country ______because her papers weren’t in order.
【单选题】. I don’t want to go _______ I am tired of any party.
【单选题】We can accept your order ______ payment is made in advance.