更多“圆轴受扭,如图所示,已知截面上 A点的切应力为5MPa,则B”相关的问题
急性支气管炎患儿，保持呼吸道通畅的护理措施，不正确的是（）
患儿女，4岁。咳嗽3天，体温39℃，双肺有干性及不固定湿啰音。
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个人品德是个体对某种道德要求认同和践履的结果，集中体现了道德认知、道德情感、道德意志、道德信念和( )的内在统一。
A . 道德实践B . 道德行为C . 道德表现D . 道德内容
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A Hydrogen Future In the minds of some analysts, hydrogen is finally emerging as a nonpolluting, re...What does the third paragraph imply [A] People will continue to use fossil fuels in spite of the
Although it is the most abundant element in the universe, hydrogen is not a primary energy source that exists in nature, as do crude oil and natural gas. Rather, it is an energy carrier ——a secondary form of energy that cannot be found freely in usable form, but has to be manufactured, like electricity. Today, most hydrogen is extracted from fossil fuels. In the future, hydrogen will be made from clean water and clean solar energy.
Hydrogen can match the effectiveness of fossil fuel in powering cars, planes, and ships and in heating homes, schools, and office complexes ——without creating pollution. When burned in an internal-combustion engine, hydrogen emits a virtually harmless water-vapor exhaust. When hydrogen is burned with atmospheric oxygen in an engine, the resulting emission is clean: no unburned hydrocarbons, no carbon monoxide or carbon dioxide.
Hydrogen is an essential component of fuel cells for vehicles and other applications. Fuel-cell engines can be more than twice as efficient as internal-combustion engines, argues Hoffmann. Fuel-cell engines electrochemically combine hydrogen and oxygen in a flameless process that produces heat, electricity, and distilled water. The fact that it is environmentally benign has made hydrogen energy an increasingly attractive alternative to fossil fuels as concerns about resource depletion and global warming have been growing.
"The question is no longer whether we are headed toward hydrogen, but how we should get there, and how long it will take," says Worldwatch Institute research associate Seth Dunn.
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二氯氧锆
A．295～300nmB．217～220nmC．1700～1800cmˉ1D．420nmE．低40cmˉ1
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气管分为左右主支气管分别进入左右肺内的位置是
A．在平胸骨角即胸椎4、5水平处
B．第6胸椎水平
C．第7颈椎处
D．胸骨上窝
E．胸骨下角
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对热原性质的正确描述为
A．不耐热，不挥发
B．耐热，不溶于水
C．挥发性，但可被吸附
D．溶于水，不耐热
E．不挥发性，溶于水
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渐开线齿廓啮合的特点是（)。
A．定传动比
B．定角速度
C．可分性
D．轮齿的正压力方向不变
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户内式带熔断器的高压负荷开关型号为（）
A、FW3－35
B、FN3－10/400
C、FN3－10R/400
D、FW3－10R/400
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循环水中断时，不会影响下列设备运行的是()。
A、反应进料泵B、反应注水泵C、新氢压缩机D、循环机压缩机
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下列对金融机构违反反洗钱法律、规章的行为没有行政处罚权的机构是（)。
A、人民银行总行B、市中心支行C、省一级分行D、县(市)支行
B、市中心支行C、省一级分行D、县(市)支行
C、省一级分行D、县(市)支行
D、县(市)支行
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根据公司法的规定，公司自分配当年税后利润时，必须提取利润的()列为公司的法定公积金A. 10%B.
根据公司法的规定，公司自分配当年税后利润时，必须提取利润的()列为公司的法定公积金 A. 10% B. 5% C. 5%-10% D. 5%-20%
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某普通办公室长10m、宽6．6m、吊顶高2．8m，照度标准值为300lx，维护系数0．8，显色指数Ra2≥80，回答下列问题。灯具配光选择为（）。
A . A.宽配光
B . 中配光
C . 窄配光
D . 特窄配光
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牛膝的功效不包括
A．活血
B．补肝肾
C．强筋骨
D．利水通淋
E．引火归元
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