软件设计要遵循的基本原则包括(30)。① 模块化 ② 抽象 ③ 封装 ④ 信息隐蔽
A.①②③④
B. ①②④
C.②③④
D.①②③
参考答案:B
The firm was badly in ______need of a manager with ______better command of French.
A.a; /
B.the; a
C./;a
D./;the
发电机电压达不到额定值有什么原因?