使用粗缆组建局域网时,如果使用中继器设备,那么,粗缆可能达到的最大长度为( )。

题型:单项选择题

问题:

使用粗缆组建局域网时,如果使用中继器设备,那么,粗缆可能达到的最大长度为( )。

A.100m

B.1000m

C.2000m

D.2500m

考点:计算机等级考试网络技术国家计算机三级(网络技术)82
题型:单项选择题
若x1、x2是方程2x2+3x-4=0的两根,则(  )
A.x1+x2=-
3
2
,x1x2=2
B.x1+x2=
3
2
,x1x2=-2
C.x1+x2=-
3
2
,x1x2=-2
D.x1+x2=
3
2
,x1x2=2
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在(1-x)4-x3(1+3x)的展开式中,含x4项的系数为______.

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非住宅商品房的保修期不得低于建筑工程承包单位向建设单位出具的质量保修书约定保修的存续期。()

题型:单项选择题


A patrol team of sea lions and dolphins featured in a large-scale military exercises being conducted by the U. S. and its allies in the Pacific Ocean. The machine (1) took part in simulated mine recovery and mine detection missions during the biennial Rim of the Pacific Exercise (RIMPAC) war games. The (2) started on June 19 and will run (3) Friday.
"There are a number of mechanical systems that work in those areas. (4) high-tech gadgets deployed by the military can’t (5) the natural skills of dolphins and lions," said Tom Lapuzza, spokesman for UN Navy’s Marine Mammal Program. Sea lions have "incredible good underwater (6) " and can dive down to 300 meters to catch a recovery line to a mine, he said. Dolphins use sonar to (7) mine.
Human beings have a long (8) of training animals to join the military. Horses have been the most widely-used animals (9) the recorded history of (10) . In early times, horses were used to (11) chariots or to (12) armored forces. With the development of modem weapons and motorized (13) , the use of horses for military purposes fell into (14) . (15) , horses were still used (16) by the German army during World War II for transporting (17) and equipment, including artillery.
During World War II, (18) with explosives strapped to their backs were used as anti-tank weapons. In other (19) , they were used for detecting mines. Some dogs were also used as messengers.
Other animals have also (20) in the military. Recorded history shows the use of elephants for military purposes as early as 1,100 B. C.. They were employed during World War II by both the Japanese army and the (21) .
There are records showing that over 100,000 reindeer were used by Finland to tow sleds during World War II. They carried the (22) to hospitals, brought supplies to the troops and moved heavy anti-tank weapons. It is well documented that oxen have been (23) used in war as improvised beasts of burden. During World War II, spiders were employed by the Allies to spin silk for (24) in cross-hairs on bomb scopes and other optical instruments. People also are finding that Vampire bats’ ability to use echolocation is very interesting as we (25) to learn how it works and it may benefit the army.

题型:单项选择题

某食品厂因安全事故被卫生部门作出以下处理:(1)查封不符合卫生标准的货物200箱;(2)追究公司法定代表人责任;(3)罚款10000元。上述处理中,属于行政强制的有

A、查封不符合卫生标准货物200箱

B、追究公司法定代表人责任

C、罚款10000元

D、无

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