由于横波不能在水中传播,所以液浸法探伤不适用于横波。
参考答案:错
Our manager has gone to Paris, so I have to deal with all the letters during his ________.
A.appearance
B.distance
C.absence
D.presence
下列天体系统不包含地月系的是[ ]
A.银河系
B.太阳系
C.总星系
D.河外星系