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【多选题】
采暖系统的基本组成包括____( )______A.
热源
B.
管道系统
C.
散热设备
D.
排风设备
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】At each step along the way, economic pessimists warned that the economy was about to tumble into a yawning ______ .
A.
spot
B.
scar
C.
gap
D.
chasm
【简答题】相同碳原子数的饱和一元醛、酮互为(),通式为()
【简答题】油漆桶工具的快捷键是?
【简答题】Most people are worried about the health of economy. But does the economy also affect your body health? It does, but not always the ways you might expect. The data(数据) on how an economic downturn infl...
【单选题】At each step along the way, economic pessimists warned that the economy was about ____ tumble into a yawning chasm.
A.
into
B.
to
C.
on
D.
for
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