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计算：（1）（﹣12）÷4×（﹣6）÷2； （2） ；（3） ；（4） ；（5） ； （6）1+3+5+…+99﹣（2+4+6+…+98）．
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举一反三
【单选题】下列关于陆地水体补给关系的叙述，不正确的是（ ）
A.
陆地水体最主要的补给形式是雨水
B.
以降水补给为主的河流，夏季流量大
C.
以冰川补给为主的河流，夏季流量最大
D.
河流水、湖泊水、地下水之间往往具有相互补给关系
【简答题】建立不同学习交流社区需要()?
【单选题】下列关于陆地水体补给关系的叙述，正确的是
A.
陆地水体最主要的补给形式是冰川融水
B.
以降水补给为主的河流，夏季流量大
C.
以冰川融水补给为主的河流，冬季流量最大
D.
河流水、湖泊水、地下水之间，具有相互补给关系
【单选题】Which of the following is false？( )
A.
T he design and construction services are contracted by a single entity known as the design–builder or design–build contractor.
B.
The client commissions the consultants to produce conceptual or schematic design before leaves the project to the contractor.
C.
The contractor needs to completes the design and produces the documentation required to construct the facility.
D.
The contractor often completes the design before the construction .
【单选题】What does the writer think about machines with human-like ability?
A.
He believes they will be useful to human beings.
B.
He believes that they will control us in the future.
C.
He is not quite sure in what way they may influence us.
D.
He doesn' t consider the construction of such machines possible.
【单选题】Both steel and cement, t he two ( ) important construction materials of modern times, were introduced in the 19th century.
A.
more
B.
most
C.
best
D.
better
【简答题】河流补给的形式主要是____、______。
【简答题】使用名词,改写句子,使句子简洁精炼 1. College life makes me feel excited. 2. If you compare two ways of life carefully, you will find the former is superior to the latter. 3. The life-style has become accepted and wel...
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