【单选题】青霉素发酵生产中,三级生产罐中接种量通常控制为()?
【单选题】听力原文:I'm sorry for that. (14)
【单选题】估算 +3的值,这个值的大小是在 [ ]
【单选题】— I'm afraid I can't finish the book this week. — ____.
【单选题】维生素K维持体内在正常水平的凝血因子是:
【单选题】I’m afraid all our standard rooms are __________.
【单选题】-- I'm afraid I was sick all week . -- _____
A.
You should see the doctor .
B.
I'm sorry to hear that .
D.
What's the excuse this time ?