周尧和是中国物理冶金学家,中国工程院院士,现为()国家重点实验室学术带头人。
参考答案:凝固技术
Although he was a child, he tired to find ways _____ people _____ life more.[ ]
A. to help; enjoy
B. help; enjoy
C. to help; enjoying
D. help; enjoying
对可修产品,从一次故障到下一次故障的时间均值,称为平均寿命,记为MTTF( )