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单项选择题

高为31～50m的建筑，当其为改建项目时，而旧建筑中尚有低压散热器不能与高层系统合用时，应采喟的系统是( )。

A.应划分为低压采暖系统，统一采用低压散热器
B.应设高、低联合分区采暖系统，高、低区分别采用低压散热器
C.应划分为高区采暖系统，统一采用高压散热器
D.应设高、低区采暖系统且各自独立，高、低区分别采用低压散热器
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1999年10月1日，我国开始实行包括“        ”、“        ”和        的三大长假制度，即三个“黄金周”制度。
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B、十一
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单项选择题
Some villagers were going to celebrate an important wine festival（酒宴）in a few days′time,so?they borrowed a huge barrel from the nearest town,put it in the village square,and decided that each?of them should empty a bottle of the best wine he had into it,so that there should be plenty at the?feast（宴会）.
One of the villagers thought he would be very clever."If I pour a bottle of water in,instead of?wine,no one will notice it,"he said to himself,"because there will be so much excellent wine in the?barrel that?the water will be lost in it."
The night of the feast arrived.Everybody gathered in the village square with their bowls and?their glasses for the wine.The tap（塞子）on the barrel was opened,but what came out was pure?water.Everyone in the village had had the same idea.
The villagers borrowed a huge barrel in order to__________.
A.holdwater
B.holdwine
C.taketheplaceofwinebottle
D.emptybottles
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序批式活性污泥SBR除磷时，应该选取的污泥负荷和充水比是（　）。
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