怎样计算圆环的面积。

正气指的是()

A．充实于体内的精气

B．体内诸气的总称

C．具有抗邪能力的卫气

D．具有固摄作用的卫气

E．存在于人体内的具有抗邪愈病作用的各种物质的总称

对于Solaris，下列说法错误的是( )。

A．Solaris是SUN公司的高性能UNIX

B．Solaris运行在许多RISC工作站和服务器上

C．Solaris支持多处理、多线程

D．Solaris不支持Intel平台

1200÷60=______÷30=120÷______．

Australia and the United States are about the same in size, and their western lands are both not rich   5    soil. It was on the eastern coast of Australia and America that the English first settled, and both colonies soon began to develop towards the west. However, this westward   6   (move) took place   7           because the English were searching for better land than the population was increasing. Settlements of the west part of both countries developed quickly after gold    8         (discover) in America in 1849 and in Australia two years later.

Although the development of these two countries has a lot in common, there are some   9   (strike) differences as well. The United States gained its independence from England by revolution while Australia won its independence without having to go to war. Australia,  10   (like) the United States, was firstly turned into a colony by English prisoners and its economic development was in wheat growing and sheep raising. By 1922, for example, Australia had fifteen times more sheep than it had people or almost half as many sheep as there are people today in the United States. Australia and the United States have more in common with each other than either one has with most of the rest of the world.

华星水泥厂与远大建筑公司签订了材料供应合同，随后又与保证人签订了相应的担保合同。后来，华星水泥厂与远大建筑公司在合同权利义务方面发生纠纷，经人民法院认定其材料供应合同无效。

( )是《合同法》的重要基本原则，随着社会主义市场经济的发展，其重要性更加突出。

A．平等、自愿原则

B．遵守法律，维护社会公共利益原则

C．公平、诚实信用的原则

D．依法成立的合同对当事人具有约束力原则