使被连接的构件接头处局部加热熔化成液体，然后再冷却结晶成一体的方法称为（）。
A、熔焊
B、压焊
C、钎焊
D、以上都对
参考答案：A
— Oliver looks a bit upset, did you tell him the bad news?
— Yes, but I _____ him after his birthday party.
A．must have told
B．shouldn’t have told
C．needn’t have told
D．should have told
对诊断甲状腺癌有意义的是（）
A．弥漫性甲状腺肿大伴有血管杂音
B．放射性核素扫描为热结节
C．甲状腺肿大、质硬、表面光滑
D．放射性核素扫描为冷结节
