预制场或工厂化的梁段预制生产利于整体施工的( )控制。
A．安全B．进度C．质量D．误差
参考答案：C
From the dates__________on the gold coin, we decided that it was made five hundred years ago.
A．marking
B．marked
C．to be marked
D．having been marked
西药是化学合成制剂，有副作用；中药是纯天然的草药，没有副作用． ．
