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【单选题】
屋面防水层中柔性防水的材料的( )A.
合成高分子
B.
SBS高聚物改性沥青防水卷材
C.
聚氨酯
D.
细石混凝土
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举一反三
【单选题】The view from the top of the luxurious Morgan Centre down onto Beijing's Olympic Green is breath-taking, There, far below, lies the stunning' bird nest' Olympic Stadium. Right next to it is the equall...
A.
for quite a large area surrounding Beijing, there is no healthy river in any direction from it.
B.
Beijing lacks of water supply as most rivers in nearby provinces are either dried or polluted.
C.
to find a healthy river near Beijing, one needs to drive beyond a hundred miles from it.
D.
within a hundred miles of Beijing, all the rivers are polluted by the wastes from the capital.
【单选题】某技术方案的总投资1500万元，其中债务资金700万元，技术方案在正常年份年利润总额400万元，所得税100万元，年折旧费80万元。则该方案的资本金净利润率为( )
A.
26. 7%
B.
37. 5%
C.
42. 9%
D.
47. 5%
【简答题】循环系统包括( )和( )。其中,( )是( )的辅助装置。
【判断题】制冷系统包括制冷循环系统、冷却水循环系统、润滑油循环系统、载冷剂循环系统(如:空调冷冻水),其中制冷循环最为复杂和重要,通常制冷系统亦即制冷剂循环系统。
A.
正确
B.
错误
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