我国的技术创新体系要建立以( )为依托，开放式的技术创新服务体系。
A．技术B．服务C．城市D．企业
参考答案：C
一Could you tell me _______ for class yesterday?
—Because my bike was broken on the way. [ ]
A. why did you come late
B. why you came late
C. why do you come late
D. why you come late
表层局部范围内抵抗压人产生塑变的能力称为( )。
A．硬度
B．冲击韧性
C．耐疲劳性
D．可焊性
