编制预算时，对预算支出均以零为基础，从实际需要与可能出发，逐项审核各项费用开支的必要

一个书包原价125元，打8折后售价是______元，便宜了______元．

水溶性环糊精衍生物（）

A．γ-环糊精

B．甲基-β-环糊精

C．α-环糊精

D．乙基-β-环糊精衍生物

E．β-环糊精

用括号内单词的适当形式填空

1. How much do these potatoes ______(weight)?

2. Large ______ (amount)of money are being used in our company at the moment.

3. The house still needed a lot of work, but at ______ (1ess)the kitchen wa8 finished.

4. Your English is much better, but there’s still room for ______ (improve).

5. I wonder if I'll be ______(fitful) enough to take part in the race.

有机农业。

进风井筒中发生火灾时，为防止火灾气体倾入井下巷道，必须采取的措施是（）。

A、反风

B、停止主要通风机运转

C、加强主要通风机的功率

D、加强局部通风机的功率