在校园歌手大赛中,七位评委对某位歌手的打分如下:9.8,9.5,9.7,9.6,

题型:填空题

问题:

在校园歌手大赛中,七位评委对某位歌手的打分如下:9.8,9.5,9.7,9.6,9.5,9.5,9.6,则这组数据的平均数是(    ),极差是(    )。

考点:极差平均数
题型:填空题

点A是反比例函数图象上一点,它到原点的距离为10,到x轴的距离为8,则此函数表达式可能为(     )

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检查油罐时一次上罐不得超过()人,不准在罐顶上跳跃。

A、2

B、3

C、4

D、5

题型:填空题

通过编制工程进度曲线,可获取的信息不包括()

A.工程量完成情况

B.实际工程进度速度

C.关键工作

D.进度超前或拖延的时间

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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:填空题

用于化脓性链球菌鉴定的是

A.杆菌肽试验
B.奥普托欣试验
C.CAMP试验
D.胆汁七叶苷试验
E.血浆凝固酶试验

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