惠更斯原理在（）中获得了广泛的应用。
A.超声检测
B.磁粉探伤
C.渗透检测
D.以上都不对
参考答案：A
---Would you like _______milk? ---No, _______.
A．any; I wouldn't
B．some, thanks
C．any; thanks
D．some; I don't
狭义相对论是哪部著作创立的（）
