matrix hardness造句

例句与造句

1. The influence factors are crack size , matrix hardness , carbon fiber surface defect and carbon fiber modulus
   其影响因素主要为基体裂纹大小、基体硬度、碳纤维表面缺陷、碳纤维模量等。
2. It's difficult to find matrix hardness in a sentence. 用matrix hardness造句挺难的