离心风机在不同转数下运行时，其喘振流量（）。
A、不相同
B、相同
C、无法比较
D、与转数无关
参考答案：A
9. If you plant a tree, you should ____________ the ____________ first.
按《会计档案管理办法》规定，（）不属于会计档案的范围。
A.会计凭证
B.会计档案移交清册
C.会计档案销毁清册
D.年度财务预算
My grandpa is 33 years ____________ ____________ my mother.
I ____________ good ____________ yesterday.
The people are ____________ and ____________.
Sometimes I ____________ ____________ after school.
I ____________ ____________ for my friends yesterday.
You can ____________ the No. 3 bus ____________ school.
He likes ____________ ____________.
The rain comes ____________ the ____________.
If you plant a tree, you should ____________ the ____________ first.
Mike often ____________ ____________.