阀门在运行中产生振动和噪声的主要原因有哪些?

题型:名词解释

问题:

阀门在运行中产生振动和噪声的主要原因有哪些?

考点:汽轮机检修汽轮机运行与检修汽轮机运行与检修题库
题型:名词解释

常发生于更年期或绝经后

A.40岁,单侧囊性包块,直径4cm
B.28岁,双侧囊实性包块,直径8cm,活动
C.50岁,子宫后陷凹有不平、实性结节,有腹水
D.35岁,痛经,后陷凹有结节
E.30岁,原发不孕,低热,腹水,盗汗,消瘦

题型:名词解释

Make a tentative guess _____ Peking Man _____ have done and used thousands of years ago.

A.that; may

B.that; must

C.what; may

D.what; should

题型:名词解释

患者胃脘隐痛,痞胀不舒,食后胀甚,不思饮食,时作嗳气,面色萎黄,倦怠神疲,舌淡,苔薄白,脉虚弱,宜诊为()。

A.脾气虚证

B.胃气虚证

C.脾虚气陷证

D.气虚证

E.胃肠气滞证

题型:名词解释


Health officials in western Siberia are to begin in slaughter of thousands of birds today after identifying Russia’s first outbreak of a bird flu strain that can be fatal in humans. Doctors in neighboring Kazakhstan have also (1) that a 19-year-old poultry worker (2) admitted to hospital with (3) of bird flu, only to be diagnosed (4) double pneumonia.
The H5N1 strain of avian (5) has killed 60 people (6) 2fib in Vietnam, Thailand, Cambodia and Indonesia, but has rarely been found in birds or humans (7) Asia.
Health officials (8) that HSN1 is infecting migrating birds, which could spread the (9) into Europe. Earlier this year China registered the first outbreak of H5N1 (10) wild birds, some of which (11) to breeding grounds in Siberia. These birds could come (12) contact with others flying to Europe and North America.
Russia’s (13) began in the Novosibirsk (14) , about 1,750 miles (15) of Moscow in the Asian part of Russia, early last month, but the veterinary service (16) the virus only last week. Valery Mikheyev, the chief sanitary doctor of Novosibirsk, said that teams had been (17) the (18) birds and supervising the slaughter in13 (19) villages. He said, "The state of (20) of the inhabitants of these areas gives (21) cause for alarm. Up to 6,000 people are being (22) per day.
The virus seems to have (23) only private farms that let (24) mix with wild birds. Further outbreaks were registered in the Omsk and Altai regions, but the strain had (25) to be determined, Russia’s Emergency Situations Ministry said.

题型:名词解释

电梯对重的主要功能是为了减少()。

A、曳引电动机的功率

B、载重量

C、曳引轮上的力矩

D、蜗轮上的力矩

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