【简答题】 Mary: 16 John: That’s Nancy, 17 Mary: What’s she like? John: 18 Mary: What does she like? John: 19 Mary: Do you often play together? John: 20
【单选题】关于虚函数的描述中,哪项是正确的___
C.
基类中说明了虚函数之后,派生类中与其对应的函数可不必说明为虚函数
D.
派生类的虚函数与基类的虚函数有不同的参数个数和类型
【单选题】. . —— What’s up ,Mary? ——I’m worried about the interview I had yesterday. ——____,and let’s keep our fingers crossed and hope for the best.
【多选题】品质因数Q值的大小对谐振曲线的影响正确的是()。
B.
Q值越大时,谐振曲线的顶部越尖锐,电路选择性越好
C.
Q值越小,谐振曲线的顶部越圆钝,选择性越差。
D.
Q值越大,谐振曲线的顶部越圆钝,选择性越差。
【单选题】--- What’s the matter, Mary? You looked upset. --- I failed again in my math exam. I’m really sorry because I don’t want to ____ my parents down.
【单选题】What’s wrong with Mary?
【判断题】谐振电路的品质因数值越大,谐振曲线越尖锐,电路选择性越强。
【单选题】What’s wrong with Mary?
【单选题】Q: What’s wrong with Mary?
【单选题】关于虚函数的描述中,哪个是正确的?
C.
虚函数既可以在函数说明时定义,也可以在函数实现时定义
D.
派生类的虚函数与基类中对应的虚函数具有相同的参数个数和类型