根据题意得:x-5≥0,
解得x≥5.
_______ Anirban Maitra, a professor at Oxford University, Jack’s success would not have been possible.
A.If it wasn’t for
B.Were it not for
C.Had it not been for
D.If it hasn’t been for
简述胶体物质、高价金属离子、再生剂不纯引起树脂污染的原因?