.

By the time he comes back, I’m sure we ________ all these rooms of the lab. Therefore, he doesn’t have to return.

A．have cleaned

B．will be cleaning

C．will have cleaned

D．have been cleaning

注射模的实际厚度应该（）

A、大于注塑机的最大模厚

B、小于注塑机的最大模厚

C、大于v最小模厚

D、小于注塑机的最小模厚

E、等于注塑机的最大模厚