高速钢的含碳量范围在0.70-1.65%之间，以保证足够的碳形成合金碳化物。
参考答案：对
— Was the test you took yesterday easy?
— _____ but easy, but I did my best. [ ]
A. Something
B. Everything
C. Nothing
D. Anything
（）
A.A
B.B
C.C
D.D
（）