超声波由钢垂直射入水时,声压反射率小于0,这意味着()
A.透射能量大于入射能量
B.反射波相位与入射波相位相反
C.超声波无法进入水中
D.以上都不对
参考答案:B
下列属于互补商品的是( )
A.牛肉与猪肉
B.汽车与火车
C.汽车与汽油
D.电话与电灯
Adhesions are _________ formed within the body in response to inflammation or injury.
A.that thin bands of scar tissue
B.they thin bands of scar tissue when
C.thin bands of scar tissue
D.thin bands of scar tissue able to