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【单选题】
WWW是internet上的一种A.
浏览器
B.
协议
C.
协议集
D.
服务
手机使用
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举一反三
【单选题】if a speaker uses a simple example of the well-known Golden Gate Bridge when illustrating the topic of suspension bridge, what is his purpose by doing so?
A.
make his speech vivid
B.
make his delivery more touching and powerful
C.
use example to clarify his idea
D.
use example to reinforce his idea
【单选题】在船舶中央空调的夏季降温工况中，保持合适舱室温度的措施中不包括（）。
A.
采用两组或以上的冷剂电磁阀及热力膨胀阀为同一台空冷器供制冷剂
B.
回风温度控制冷剂电磁阀的开闭
C.
根据空冷器中的冷剂蒸发压力对压缩机进行能量调节
D.
采用空气自动加湿环节
【单选题】What is the main reason that the Golden Gate Bridge is entitled as a world wonder? Choose the most appropriate reason.
A.
Because it is a suspension bridge
B.
Because it is the seventh longest one in the world.
C.
Because it is the second longest one in the world.
D.
Because such a long suspension bridge was built in 1930s when the technology was quite limited.
【单选题】Consider the following experiment. Carefully isolated liver mitochondria are placed in a weakly buffered solution. Malate is added as an energy source, and an increase in oxygen consumption confirms t...
A.
The proton motive force will be reduced to a value of zero.
B.
There will be no change in the proton motive force.
C.
The proton motive force will be increased.
D.
The proton motive force will be decreased but to a value greater than zero.
E.
The proton motive force will be decreased to a value less than zero.
【单选题】由于城市中辐射状况的改变，工业余热和生活余热的存在，蒸发耗热的减少，而形成的城 市区温度高于郊区温度的一种小气候现象，我们称之为热岛效应。下列各项措施中不能改善热岛效应的是( )。
A.
建设若干条林荫大道，使其构成城区的带状绿色通道
B.
控制使用空调器，提高建筑物隔热材料的质量
C.
用透水性强的新型柏油铺设公路，以储存雨水，降低路面温度
D.
在城市的建设中，建筑物以高层为主，限制别墅的开发
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