称重
参考答案:
称量悬于孔内钻具质量的作业。
— Alice, you feed the bird today,____ ?
— But I fed it just now. [ ]
A. Do you
B. will you
C. dont't you
D. didn't you
1#反渗透共有()个压力容器,共()根膜,()为排列。