最小的质数与最小的合数的和的倒数是______.
最小的质数是2,最小的合数是4,2+4=6,6的倒数是16.
故答案为:16.
He had no sooner finished his speech ________ the students started cheering.[ ]
A. since
B. as
C. when
D. than
Ni在1Cr18Ni9Ti钢中的主要作用是()
A.提高淬透性
B.固溶强化
C.扩大Fe-Fe3C相图中的γ相区
D.细化晶粒