模具表面的哪些加工缺陷可能会使模具在热处理时开裂：拐角处无圆弧过渡、（）、大芯头无工艺孔。
参考答案：凹槽或盲孔
星空极速的用户可以通过打开WINXP（）降低感染病毒的风险.
The man,_______ is often parked in front of our house, is a famous surgeon.
A．who’s car
B．of which the car
C．the car of which
D．whose car
