对电力系统并列运行的暂态稳定性而言,最不利的短路故障是()A、三相短路B、单相接地短

题型:单项选择题

问题:

对电力系统并列运行的暂态稳定性而言,最不利的短路故障是()

A、三相短路

B、单相接地短路

C、两相短路接地

D、两相短路

考点:电力系统调度运行考试电力系统调度运行考试题库
题型:单项选择题
阅读下面的图表,完成后面的题目。
        某校图书馆学生阅览室共有10 万册图书,在最近的一次图书状况调查中,调查人员发现:
图书状况
完好无损
损坏较轻
损坏较重
损坏严重
图书数目(册)
20000
25000
40000
15000
请根据图表所反映的情况,写出两条结论:
                                                                        
                                                                        
题型:单项选择题

认真观察这幅题为“摇钱树”的漫画,分析并写出其寓意。

______________________________________________________

题型:单项选择题

实施BSP方法的目的是制定企业信息系统的

A.实施计划

B.战略规划

C.开发计划

D.数据规划

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

JD-4绞车采用()组综合块式制动闸。

A、1

B、2

C、3

D、4

更多题库