用自凝塑料对修复体进行糊塑成型修理时,应在()
A.糊状后期
B.黏丝后期面团早期
C.面团期
D.面团后期
E.橡皮期
参考答案:A
A middle-aged woman came ____to the bus stop only ___ the bus had gone.
A.to run; to find
B.and run; finding
C.running; to find
D.running; finding
简单冲裁模只用于()的冲裁加工。
A、精度要求高
B、形状简单
C、产量不大
D、产量大