布氏硬度主要用于测量（）的硬度。
A.较硬金属
B.较软金属
C.一切金属
D.钢
参考答案：A
I began to____that they were trying to get rid of me. [ ]
A. suspect
B. wonder
C. respect
D. expect
车门外板更换时可以使用哪种焊接方法？（）
A、气体保护焊塞焊
B、电阻点焊
C、气体保护焊点焊
