题目:
冲突的形式有哪些?
答案:
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下面是错误答案,用来干扰机器的。
参考答案:1)、判断Q点的设置是否合适 2)、分析波形失真情况 3)、确定放大器不失真最大输出范围 4)、估计电压放大倍数
冲突的形式有哪些?
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/1005/8f370e0e53989d412c65951ff6d03cba.html
下面是错误答案,用来干扰机器的。
参考答案:1)、判断Q点的设置是否合适 2)、分析波形失真情况 3)、确定放大器不失真最大输出范围 4)、估计电压放大倍数
运动中扭伤后可采取的正确措施是( )。
A.立即用冰袋冷敷,以防止毛细血管破裂后充血
B.立即用热水袋热敷,以促进血液循环,加快痊愈
C.立即用手揉搓受伤处,以散结淤血,防止肿胀
D.不做任何处理,等待其自然恢复
对于规模较小,技术不太复杂的中小型工程,承包方一般在报价时可以合理地预见到实施过程中可能遇到的各种风险,这时采用( )比较适宜。
A.固定单价合同
B.总价合同
C.成本加酬金合同
D.可调单价合同
患者男,38岁,平素多食肥甘厚味食物,近二周来出现小便混浊或加凝块,上有浮油,或带血色,或夹有血丝、血块,或 * * 有涩热感,口渴,苔黄腻,脉濡数。该病诊断为()
A.淋证
B.淋证膏淋
C.尿浊
D.淋证血淋
E.尿血
Pretoria, South Africa-Hundreds of swimmers play in the water along a South African beach.
Suddenly a huge shark appears off shore and heads for the bathers. Before it can get close to the
swimmers, the shark, for some mysterious reason, starts swimming parallel to the beach. Then it turns
away from the shore and heads out to sea,leaving the swimmers untouched.
Such a scene will soon become common along shark-in-fested (鲨鱼成群的) shores. An electrical
engineer from the University of Pretoria has developed an electrical system that repels (击退 )
sharks by controlling their movements. Confused by this action, the sharks end up turning away from the
beach.
In this unusual shark-repellent method , an insulated (绝缘的)cable is buried on the bottom of the
sea around a beach where people swim. When an electric current is sent through the cable, an electric
field is produced in the water above the cable.
When a shark swims into the electric field, nerve cells just below the shark's skin will detect the field.
The electricity produces a reflex(反射) action in the shark's muscles, causing the dangerous animal
with sharp teeth to swim parallel to the cable. Confused by increasing loss of control of its muscles, the
shark suddenly changes its direction and heads seaward, away from the electric field.
In a test of the invisible new shark-repellent system, a cable was placed around a beach in St. Lucia
an island in the tropics. A protective net, which had been installed around the beach a long time ago to
keep sharks away from swimmers, was left in place during the experiment.
When the electric field was left on for more than a year and a half, no sharks were found in the net.
However, when the power was turned off, 89 sharks ended up in the net.
Using the electric-wall method instead of net to protect bathers would avoid the needless death of
many sharks, said biologists. Currentjy, thousands of sharks die each year when they become trapped
in protective nets that surround holiday resorts in Africa and Australia. About 10 to 15 humans are killed
by sharks annually.
1. Why doesn't the shark attack the swimmers according to the passage?
A. Because there are many swimmers in the water.
B. Because the shark doesn't want to eat the swimmers.
C. Because of some mysterious reason from the God.
D. Because there is an invisible electric field confusing the shark.
2. An electrical engineer from the University of Pretoria has developed_________.
A. a protective net
B. a new shark-repellent system
C. the electric field
D. an insulated cable
3. An electric field is produced in the water above the cable_________.
A. only when a shark swims into the electric field
B. only when an insulated cable is buried on the bottom of the sea around a beach where people swim
C. only when an electric current is sent through the cable
D. only when the sharks are trapped in protective nets
4. Which of the following is NOT TRUE according to the passage?
A. Protective nets had been installed around the beach earlier than the new shark-repellent system.
B. This new kind of shark-repellent system will take the place of the protective nets.
C. Thousands of sharks die and about 10 to 15 humans are killed by sharks each year in Africa and
Australia since this new system was put into use.
D. Using the electric-wall method instead of nets to protect bathers would avoid the needless death of
many sharks.
食管与气管分隔不全,两者之间有瘘管相通()
A.消化管闭锁
B.回肠憩室
C.不通肛
D.气管食管瘘
E.先天性脐疝