主要用于金属间摩擦磨损的零件,如齿轮、牵引车底盘等的堆焊的金属是()。
A.珠光体钢
B.奥氏体钢
C.马氏体钢
D.铁素体钢
参考答案:C
— How's your tour around the North Lake? Is it beautiful?
— It _____ be, but it is now heavily polluted. [ ]
A. will
B. would
C. should
D. must
上市公司财务状况异常是怎么回事特别处理是什么意思