无损探伤检验是对焊缝内在质量的检验，其具体手段有( )。
A．射线探伤
B．超声波探伤
C．磁粉探伤
D．气密性检验
参考答案：A,B,C
— Mum, I am sorry, but I failed in the English exam.
— So you ________ get the MP4 you want. I am sorry, too. [ ]
A. shall not
B. might not
C. needn't
D. shouldn't
流行性腮腺炎的病理特征是
A．腮腺的急性化脓性炎症B．腮腺的急性非化脓性炎症C．非化脓性胰腺炎D．睾丸炎或卵巢炎E．病毒性脑膜炎或脑膜脑炎
rry, too. [ ]