题目内容

各种输送设备及管路等内表面应。

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应尽量混合成品的输送距离，防止饲料分级

药物添加剂必须直接添加到中

If you have not caught what the guest said, you may say:

A. What did you say, sir?
B. Uh?
C. What do you mean?
D. I beg your pardon?

When you express your apologies to your guest you may say "I beg you pardon, sir" in rising tone.

A. 对
B. 错