实际回收率=精矿量÷原矿量100%。

Last summer, Cathy’s family went to New York City for their summer vacation. They stay there for two weeks. New York City has about seven and a half million people. It is the largest city in the United States.

First they visited the Statue of Liberty. It is one of New York’s most well-known historical sites（历史景点）. Millions of people visit it every year.   On the second day, they went to the Empire State Building. From the top of the building, they saw most parts of New York. On the third day, they visited the Metropolitan Museum. In this museum, they saw a lot of famous paintings. During the rest time of the week, Cathy went to Bronx Zoo with her younger brother and sister.

In the second week, the family visited Long Island. They all had a good time.

小题1:Cathy’s family went to ________ for their summer vacation.

A．New York

B．London

C．Paris

D．Beijing小题2:New York has about ________ people.

A．7,000,000

B．7,500,000

C．8,000,000

D．8,500,000小题3:The underlined word “It” refers to _________.

A．New York

B．the United States

C．Cathy’s home

D．New York’s historical site小题4:Cathy’s family visited _________ on the first day of their summer vacation.

A．the Statue Liberty

B．the Empire State Building

C．the Metropolitan Museum

D．Bronx Zoo小题5:_________ they visited Long Island.

A．On the first day

B．In the first week

C．On the second day

D．In the second week

如图所示，水平绝缘粗糙的轨道AB与处于竖直平面内的半圆形绝缘光滑轨道BC平滑连接，半圆形轨道的半径R=0.40m．在轨道所在空间存在水平向右的匀强电场，电场线与轨道所在的平面平行，电场强度E=1.0×10⁴N/C．现有一电荷量q=+1.0×10^-4C，质量m=0.10kg的带电体（可视为质点），在水平轨道上的P点由静止释放，带电体恰好能通过半圆形轨道的最高点C，然后落至水平轨道上的D点．取g=10m/s²．试求：

（1）带电体在圆形轨道C点的速度大小．

（2）D点到B点的距离x_DB．

（3）带电体运动到圆形轨道B点时对圆形轨道的压力大小．

（4）带电体在从P开始运动到落至D点的过程中的最大动能．

能宣畅气机，清利湿热的方剂是（）

A.五苓散

B.三仁汤

C.八正散

D.平胃散

E.二陈汤

下列选项中，( )属于行政领导的职能。

A．贯彻上级指示、拟订计划、组织实施、公关协调、监督检查、发现人才

B．贯彻执行、计划决策、组织指挥、协调沟通、监督控制、选人用人

C．执行、计划、组织、协调、监督、选人、公关

D．贯彻执行、计划决策、组织实施、选人用人、公关协调

卧式（）壳管蒸发器，制冷剂在管外空间气化，载冷剂在管内流动