直流电机的励磁方式有他励、并励、串励和复励四种。
参考答案:对
83. It is said that Hong Kong will be joined _____ the mainland _____ a beautiful bridge on the sea in the near future.
A.by; with
B.with; by
C.by; to
D.to; by
软件测试是软件质量保证的必要和重要环节,下述哪些属于软件测试的固有内容 Ⅰ.软件功能 Ⅱ.软件结构 Ⅲ.软件性能 Ⅳ.软件资料
A.Ⅰ和Ⅱ
B.Ⅰ和Ⅲ
C.Ⅰ,Ⅱ和Ⅲ
D.全部