按冲砂液循环方式的不同，可将冲砂方法分为正冲、反冲和正反混合冲三种。
参考答案：错
Can you lend me the book ______the other day?
A．about which you talked
B．which you talked
C．about that you talked
D．that you talked
在鸟卵的结构中，胚胎发育的部位是[ ]
A．卵黄
B．卵白
C．胚盘
D．气室
