直流电动机按其转子转速和定子磁场的转速关系又分为异步电动机和同步电动机两类。()
参考答案:错
Even though Jane told him to leave her alone, her father still her to the doctor.
A.looked
B.obeyed
C.envied
D.accompanied
建设项目经济费用效益分析的主要指标有()。
A.经济内部收益率
B.投资回收期
C.利息备付率
D.资产负债率