使用人防工事应注意那些事项？

IEEE 802.3u标准对802.3的物理层作了调整，其目的是使得物理层在实现100Mbps速率时所使用的传输介质和信号编码方式的变化不会影响______。

A．LLC子层

B．网络层

C．MAC子层

D．传输层

既能使溴水褪色又能跟金属钠反应，还可以和碳酸钠溶液反应的物质是（　　）

A．CH₂=CH-CH₂OH

B．

C．CH₂=CH-COOH

D．

下列关于中断的表述中，错误的是( )。

A．向CPU提出中断请求的叫中断源

B．发生中断时，被打断的程序暂停点称为断点

C．CPU执行有关的中断处理程序称为中断响应

D．中断装置和中断处理程序统称为中断系统

高等教育比较法的类型包括（）。

A.相异比较

B.同类比较

C.横向比较

D.纵向比较

Egyptian wine has an extensive history within the history of Egyptian civilization. Grapes were not (1) to the landscape of Egypt, rather the vines themselves are (2) to have been imported from the Phoenicians, (3) the actual origins remain in (4) . What is known, is that (5) the third millennium BC, Egyptian kings of the first (6) had extensive wine cellars, and wine was used extensively in the temple ceremonies. The main (7) of wine in Egypt, took place between the king, nobles, and the priests in temple ceremonies, and is (8) by numerous painted relief’s, and other (9) evidence. The vineyards of ancient Egypt, were quite different from the modern methods of wine making today. (10) viticulture ( or wine making), ceased to (11) an exclusively ceremonial purpose, the Egyptians began to experiment with simple structures for their vines to train on, (12) found a way to train their vines so they were easy low (13) bushes, and found ways for the soil to (14) more moisture for the vines. Egyptian wine making experiments included the use of different wine presses, adding heat to the must ( the grape juice ready for fermentation) (15) make the wine sweet, and differences in vat types and materials. The (16) finished product of wine, was poured through a cloth filter, and then into earthenware jars, (17) they would be sealed with natural tar and left to (18) . The Egyptians kept accurate records of their vintages, and (19) of their wines, each jar of wine was clearly (20) with it’s own vintage, and quality.

19（）

A.quality

B.quantity

C.nature

D.aura