衡量直流调速系统好坏的性能指标有哪些?
参考答案:衡量直流调速系统好坏的性能指标有衡量直流调速系统好坏的性能指标有调速范围(D),转差率(S),平滑性,经济性。
---Do you know if Helen is willing to take charge of the project?
--- , does it?
A.It takes no time
B.It counts for nothing
C.It doesn’t hurt to ask
D.It doesn’t make sense
应缴纳企业所得税为( )万元。
A.34
B.30.6
C.31.78
D.35