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【简答题】
下列物质的性质中，属于化学性质的是（ ） A．液氧为淡蓝色 B．标准状况下氢气密度最小 C．常温下二氧化硫为气态 D．氢氧化钙能中和土壤中的酸性物质
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举一反三
【单选题】听力原文： An international group Human Rights Watch says a climate of fear is developing in many parts of Afghanistan which it blames on regional warlords supported at least tacitly by the United States a...
A.
Failing power of the current government.
B.
A growing fear in many parts of the country.
C.
Power struggle among regional warlords.
D.
Unusual power of the religious diehards.
【单选题】The morning news says a school bus ______ with a train at the junction, and a group of policemen were sent there immediately.
A.
bumped
B.
crashed
C.
collided
D.
struck
【简答题】什么叫电力网？
【单选题】The morning news says a school bus ______ with a train at the junction and a group of policemen were sent there immediately.
A.
bumped
B.
collided
C.
crashed
D.
struck
【简答题】什么叫电力网、输电网、配电网？
【简答题】什么叫电力网？
【简答题】什么叫电力网（或电力系统）？
【简答题】intention
【简答题】什么叫电力网？
【简答题】三庭是指将面高分成三份,分别是
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