简述炉水循环泵的结构特点。

题型:问答题

问题:

简述炉水循环泵的结构特点。

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世界各国对证券公司的划分和称呼不尽相同,美国的通俗称谓是( ),在法律上统称为“经纪人——交易商”。

A.商人银行

B.投资公司

C.商业银行

D.投资银行

题型:问答题

土壤质地可分为四大类:即沙土、壤土、黏土、石质土,其中土壤的质地最好的是()。

A、沙土

B、壤土

C、黏土

D、石质土

题型:问答题


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:问答题

为降低变压器损耗,节约电能的主要措施有()。

A.提高电压

B.减少负载

C.改善COSφ

D.控制投入台数及容量

题型:问答题

其他砌体的门窗洞口两侧()mm和转角处600mm范围内,是不应设置扣件式钢管单排脚手架的横向水平杆的。

A、150

B、180

C、200

D、300

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