因为离子交换反应遵循等物质的量规则，所以每除去1mol的硬度必须用（）gNaCl，叫

Coffee has become the most popular American drink. Today people in the United States drink more coffee than people in any of the other countries. People drink coffee at breakfast, at lunch, at dinner and between meals. They drink hot coffee or coffee with ice in it. They drink it at work and at home. They eat coffee ice-cream and coffee candy. Coffee is black and very strong. Different people like to drink it in different ways. Some people like coffee with cream or sugar in it. Other people like coffee with both cream and sugar in it. In all ways it is served. Coffee has become an international drink.

小题1:Coffee is an _______drink.

A．interesting

B．international

C．ice cream

D．American小题2:Different people like to drink coffee

A．at work or at home

B．in different ways

C．with cream or sugar

D．between meals小题3:Today Americans drink _______coffee than people in any of the other countries. .

A．as much as

B．less

C．more

D．most小题4:The underlined word "strong" here means _______.

A．坚固的

B．淡的

C．清的

D．浓的小题5: _______is the most popular American drink.

A．Black tea

B．Coffee

C．Water with ice

D．Whisky

采用两根固定不动的桅杆吊装数量较多的塔群时，应采用的吊装方法为（）。

A．双桅杆递夺法

B．双桅杆滑移法

C．联合吊装法

D．吊推法

第一代数据库系统的出现，标志着

A．文件管理已由自由管理阶段进入了数据库系统阶段

B．数据管理由文件系统阶段进入了数据库系统阶段

C．数据管理由人工管理阶段进入了文件系统阶段

D．数据管理由人工管理阶段进入了数据库系统阶段

强化食品的种类有（）

A.膳食补充剂的添补，副食强化

B.载体的选择，副食强化

C.主食强化，副食强化

D.水强化，副食强化

E.固体强化，副食强化