印刷方式主要有()等。
A、凹版印刷
B、平版印刷
C、凸版印刷
D、孔版印刷
E、喷墨印刷
参考答案:A, B, C, D
He spoke very fast and very _____ people understood what he said.
A.little
B.a little
C.few
D.a few
一般粗加工选()
A、YG8
B、YG3
C、YT30
D、以上都可以