【单选题】what did Stephen's mother teach him later?
A.
How to do an experiment.
B.
how to carry a milk bottle.
C.
how to clean up spilled milk.
D.
how to avoid making mistakes.
【判断题】类图和对象图合称为结构模型视图或者静态视图,用于描述系统的结构或静态特征。
【单选题】关于初级精母细胞的描述 , 哪项错误
D.
在生精小管的切面中可见到处于不同 分裂时期 的初级精母细胞
E.
经过 DN A 复制后, 进行第一次减数分裂,形成两个次级精母细胞
【单选题】类图(Class Diagram)对应于( ),类图使用类来描述系统的静态结构,类图包含类和它们之间的关系,它描述系统内所声明的类,但它没有描述系统运行时类的行为。
【单选题】what did Stephen's mother do when she came into the kitchen?
A.
she gave him a long leture.
B.
she shouted at him in anger.
C.
she enjoyed the wonderful mess.
D.
she cleaned up the mess with him.