慢剪的剪切速率为（） A.小于0.8mm/min B.小于1.8mm/min C.小

任务型阅读 根据短文内容，完成所给的任务。（5分）

Mr. White is a teacher in our school. He is from Canada. He came to China two years ago. He is kind and helpful. We all like him. His son, Rick, is my good friend. We are in the same class.

Today is June 25th. It is Rick’s fourteenth birthday. We plan to hold a party for him. Here is the program for his birthday party.

小题1:My classmate, Rick, comes from__________.

小题2:Rick’s father is a_________.

小题3:Rick was born on__________25th.

小题4: Maria will perform          _at the party.

小题5:__________will play the piano because she is good at it.

企业价值评估方法中，适应性较广，尤其适应对毛利率稳定的行业进行估值的方法是（）。

A.市盈率法

B.股利折现法

C.现金流量折现法

D.市盈率相对盈利增长比率法

如果把“文艺复兴”、“新航路开辟”、“英国资产阶级革命”确定为一个学习单元，则这个单元的主题是

A．西欧古代社会的辉煌

B．跨入近代社会的门槛

C．近代社会的确立与动荡

D．近代社会的发展与终结

在模锻件上两平面的交角处，一般均需做成圆角，这主要是为了（）

A.提高金属塑性

B.降低金属变形抗力

C.外形美观

D.金属易于充满模膛

彻底改变多旋翼市场，并且是中国目前最大的民用无人飞行器企业是（）。

A.大疆创新

B.极飞

C.零度智控

D.亿航