列二元一次方程组需要几个等量关系？

In America, just as in Europe, men usually open doors for women, and women always walk ahead of men into a room or a restaurant, unless the men have to be ahead of the ladies to choose the table, to open the door of a car or do some other things like the above. On the street, men almost always walk or cross the street on the closer side of the ladies to the traffic. But if a man walks with two ladies, he should walk between them. Then if the host or hostess or both of them come in a car to get their guest for dinner, the guest should sit at the front seat and leave the back seat though there're no people sitting on it.

小题1:In America, men usually_________.

A．walk ahead of women

B．eat in a restaurant

C．walk behind women

D．drive a car to work小题2:In the street, men __________.

A．cross the street

B．walk on the right side of the ladies

C．walk near the ladies

D．walk on the closer side of the ladies to the traffic小题3:If a man walks with two ladies, he should _________.

A．walk between them

B．run before them

C．follow them

D．go away小题4:If a man asks you to speak at a meeting, first you should say,"______".

A．How are you?

B．Is everyone here?

C．Ladies and gentlemen

D．How do you do?小题5:If Mrs. Green invites you to her house in a car, you should________.

A．jump into the car

B．sit at the front seat

C．sit at the back seat

D．drive the car

部门.DBF：部门号C(8),部门名C(12),负责人C(6),电话C(16)职工.DBF：部门号C(8),职工号C(10),姓名C(8),性别C(2),出生日期D部门.DBF：部门号C(10),基本工资N(8.2),津贴N(8.2),奖金N(8.2),扣除N(8.2)

查询有10名以上(含10名)职工的部门信息(部门名和职工人数),并按职工人数降序排序。正确的命令是【 】。

A．SELECT部门名,COUNT(职工号)AS职工人数；　　FROM部门,职工WHERE部门.部门号=职工.部门号；　　GROUP BY部门名HAVING COUNT(*)＞=10；　　ORDER BY COUNT(职工号)ASC

B．SELECT部门名,COUNT(职工号)AS职工人数；　　FROM部门,职工WHERE部门.部门号=职工.部门号；　　GROUP BY部门名HAVING COUNT(*)＞=10；　　ORDER BY COUNT(职工号)DESC

C．SELECT部门名,COUNT(职工号)AS职工人数；　　FROM 部门,职工WHERE部门.部门号=职工.部门号；　　GROUP BY 部门名HAVING COUNT(*)＞=10；　　ORDER BY 职工人数ASC

D．SELECT部门名,COUNT(职工号)AS职工人数；　　FROM部门,职工WHERE部门.部门号=职工.部门号；　　GROUP BY部门名 HAVING COUNT(*)＞=10； 　　ORDER BY职工人数 DESC

在Windows中，下列关于“任务栏”的叙述错误的是( )。

A．可以将任务栏设置为自动隐藏
B．任务栏可以移动
C．通过任务栏上的按钮，可实现窗口之间的切换
D．在任务栏上，只显示当前活动窗口名

党的工作机关如何设立、撤销、合并或者变更？（）

A.党中央工作机关的设立、撤销、合并或者变更，由中央机构编制管理部门提出方案，按程序报党中央审批决定

B.党中央工作机关的设立、撤销、合并或者变更，由中央机构编制管理部门提出方案，按程序报全国人大审批决定

C.地方党委工作机关的设立、撤销、合并或者变更，由同级机构编制管理部门提出方案，按规定程序由本级党委讨论决定后，报上级党委审批

D.地方党委工作机关的设立、撤销、合并或者变更，由中央机构编制管理部门提出方案

怎样治疗高血压？