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(天津大学2002年考研试题)有二渠道通过三段直径D=0．1m的混凝土管一条虹吸管跨过山丘取水，高水位渠道水面高程▽1=100m，低水位渠道水而高程▽2=98m，虹吸管长度L1=8m，L2=12m，L3=15m，中间有二个弯头，每个弯头的局部损失系数ζb=0．36，进口水头损失系数ζe=0．5，λ1=λ2=λ3=0．02，如图6-16所示。 (1)求虹吸管的输水能力。 (2)当z=6．0m时，求虹吸管中最大真空值hv=?
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举一反三
【判断题】Chinese martial arts, or Wushu as it is also known as kung fu are a number of fighting styles that have developed over the decades in China.
A.
正确
B.
错误
【单选题】The bizarre antics of sleepwalkers have puzzled police, perplexed scientists, and fascinated writers for centuries. There is an endless supply of stories about sleepwalkers. Persons have been said to ...
A.
There is no accurate figure of the number of sleepwalkers.
B.
Stories of sleepwalkers are all fantasies.
C.
Sleepwalkers can be considered half awake in their sleep.
D.
Voltaire knew a sleepwalker who once danced a minuet in sleep.
【简答题】In shanxi Province you may be offered brains to eat. Frightened? You shouldn't be because these brains are only a food, which is famous for its unusual name and rich nutrition(营养). Brains as a good we...
【单选题】The bizarre antics of sleepwalkers have puzzled police, perplexed scientists, and fascinated writers for centuries. There is an endless supply of stories about sleepwalkers. Person have been said to c...
A.
inconceivable
B.
unbelievable
C.
suspected
D.
implausible
【简答题】In Shanxi province you may be offered brains to eat. Frightened? You shouldn’t be, because these brains are only a food, which is famous for its unusual name and rich nutrition( 营养 ). Brains as a food...
【简答题】患儿男，胎龄34周，母亲因胎动减少入院行剖宫产术，出生体重为2300g，心率为97次/分，呼吸正常，躯体红润，唇周、面部发绀，四肢松弛，弹足底会皱眉。 1.该患儿出生时的Apgar评分为() A.4分 B.5分 C.6分 D.7分 E.8分 2.该患儿属于() A.正常新生儿 B.轻度窒息 C.中度窒息 D.高度窒息 E.极重度窒息 3.目前患儿首要的护理诊断是() A.有受伤的危险 B.气体交换...
【单选题】有关使用暖箱的描述，以下不正确的是
A.
适用于早产儿、体重<2000g的新生儿及体温不升的患儿
B.
患儿体温未升至正常之前每小时测1次体温
C.
患儿体温升至正常后每4小时测1次体温，并保持体温在36～37℃
D.
保持暖箱内湿度在55％～65％，湿化器水箱用水每天更换1次
E.
将暖箱放在阳光直射的地方，以保持箱内温度
【单选题】The bizarre antics of sleepwalkers have puzzled police, perplexed scientists, and fascinated writers for centuries. There is an endless supply of stories about sleepwalkers. Persons have been said to ...
A.
There is no accurate figure of the number of sleepwalkers.
B.
Stories of sleepwalkers are all fantasies.
C.
Sleepwalkers can be considered half awake in their sleep.
D.
Voltaire knew a sleepwalker who once danced a minuet in sleep.
【判断题】Chinese martial arts, also referred to by the term “wushu” and popularly as “kung fu” or “gung fu”, are a number of fighting styles that have developed over the centuries in China.
A.
正确
B.
错误
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