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【多选题】
闭式热水供热系统的优点有( )A.
网路补水量少。
B.
容易监测网路系统的严密程度
C.
热水供应用户的水质与城市上水水质相同且稳定
D.
在热力站或用户入口处，需安装间壁式热交换器。设备增多，投资增加，运行管理较复杂。
E.
闭式系统能更好地利用低位热能
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皮皮学刷刷变学霸
举一反三
【简答题】还原反应速度与时间的关系曲线中具有()的特点
【单选题】We cannot infer from the article that ______．
A.
there are abundant mineral reserves in the mountains
B.
China's mineral deposits are evenly scattered
C.
China is rich in non-metal deposits
D.
Research and exploration in the eastern and western parts of China have to be intensified
【简答题】1970年4月24日，我国第一颗人造地球卫星“东方红一号”发射成功，为铭记历史、传承精神，经党中央国务院批准，自2016年起将每年的4月24日设立为____日。
【单选题】By the mid-1990s the public associated video s with rst-person-shooter s, in which players careened through 3D environments, mowing down enemies with extravagant weapons.
A.
cutting down an area of grass with a machine
B.
killing someone with a fusillade of bullets or other missiles
【单选题】According to the article we know it is ______ to pr the forest from slowly disappearing.
A.
necessary but impossible
B.
necessary but difficult
C.
impossible and unimportant
D.
difficult and impossible
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