乙二醇精制塔塔顶冷凝器换热效果差会引起（）。A、塔的液位波动 B、精制塔真空度波动

两个或两个以上合作单位之间，以承包人的名义，为共同承包工程建设项目签订的合同，一般称为( )。

A．营运合同
B．联合承包合同
C．劳务分包合同
D．买卖合同

腹腔镜手术常见的并发症有（）。

A.腹腔出血

B.腹腔脏器损伤

C.腹腔感染

D.穿刺孔疝

E.以上都是

下列关于工程监理与政府主管部门监督管理的表述中，正确的是（）。

A.工程监理工作与政府主管部门的监督管理工作都是行政性监督管理

B.工程监理工作与政府主管部门的监督管理工作都具有委托性

C.工程监理工作是行政性监督管理，政府主管部门的监督管理工作具有委托性

D.工程监理工作具有委托性，政府主管部门的监督管理工作是行政性监督管理

一个Excel工作簿已经设置了“打开”与“修改”两种密码，如果只知道其“打开”密码，那么______。

A．可打开该工作簿，也可以修改，但是不能按原文件名、原文件路径存盘
B．可打开该工作簿，一旦改动数据会出现报警信息
C．可在打开工作簿对话框中看到该工作簿，但是无法打开
D．可以打开该工作簿，只有原来设置密码时选中的工作表是只读的，其他工作表都可以修改

When an invention is made, the inventor has three possible (1) of action open to him: he can give the invention to the world by publishing it, keep the idea (2) , or patent it.

A (3) patent is the result of a bargain (4) between an inventor and the state, hut the inventor gets a limited period of monopoly and publishes full details of his invention to the public after that period (5) .

Only in the most exceptional circumstances (6) the lifespan of a patent (7) to alter this normal process of events.

The longest extension ever (8) was to Georges Valensi; his 1939 patent for color TV receiver circuit was extended until 1971 because for most of the patent’s normal life there was no color TV to (9) and thus no hope for reward for the invention.

Because a patent remains permanently (10) after it has terminated, the shelves of the library attached to the (11) office contain details of literally millions of ideas that are free for anyone to use and, if (12) than half a century, sometimes even repatent. Indeed, patent experts often advise anyone (13) to avoid the high cost of conducting a search through (14) patents that the one sure way of violation of any other inventor’s right is to plagiarize a dead patent. Likewise, because publication of an idea in any other form (15) invalidates further patents on that idea, it is traditionally (16) to take ideas from other areas of print. Much modern technological advance is (17) on these presumptions of legal security.

Anyone closely (8) in patents and inventions soon learns that most "new" ideas are, in fact, as old as the hills. It is theft reduction to commercial practice, either through necessity or dedication, or through the availability of new technology, (19) makes news and money. The basic patent for the theory for magnetic recording dates back to 1886. Many of the original ideas behind television originate (20) the late 19th and early 20th century. Even the Volkswagen rear engine ear was anticipated by a 1904 patent for a cart with the horse at the rear.

17（）

A.constructed

B.sent

C.anticipated

D.based