旧的转化催化剂能否再用，主要根据停工前装置在（）生产状态时，_爱下问搜题

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问题单项选择题

旧的转化催化剂能否再用，主要根据停工前装置在（）生产状态时，催化剂的活性水平来判断。

A.安全

B.满负荷

C.正常

D.异常

答案

参考答案：B

选择题

— He, together with his parents ______going to visit Shanghai in July. How about you?

— I'm afraid I have to stay at home _ _.

A．are; on my own

B． is, by myself

C．is; by my own

D．are; on myself

判断题

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