清香型白酒的香味组分仍然是以酯类化合物占绝对优势，酯类物质中以乙酸乙酯为主导。
参考答案：对
按要求改写下列句子。
1. He needs some help.( 改为一般疑问句)
_____ he_____ _____ help?
2. I need a number 30 bus.( 就画线部分提问)
_____ _____ _____ you need?
3. His friend's father is a teacher.( 就画线部分提问)
_____ _____ his friend's father _____ ?
4. Take the fifth turning on the left.( 改为否定句)
_____ _____ the fifth turning on the left.
5. Li Ming's predication is to be an English teacher.( 就画线部分提问)
_____ _____ Li Ming's predication?
汽轮机跳闸转速（）rpm
A、2970.5rpm
B、4188rpm
C、6450rpm
D、3471rpm
