磷元素对钢材的性能有哪些影响?
参考答案:
磷是钢中十分有害的元素。磷的有害作用主要是①使钢在低温时韧性降低并容易产生脆性破坏;在高温时,②磷会降低钢的塑性。
Only ____from university ____how difficult it was to make a good career.
A.when did I graduate; I realized
B.when did I graduate; did I realize
C.when I graduate; did I realize
D.when I graduated; did I realize
组建管理团队最重要的就是“精英团队”,是强者的结合。