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【单选题】
Which statements are true， given the code new FileOutputStream（"data"， true） for creating an object of class FileOutputStream？（）A.
FileOutputStream has no constructors matching the given arguments.
B.
An IOExeception will be thrown if a file named "data" already exists.
C.
An IOExeception will be thrown if a file named "data" does not already exist.
D.
If a file named "data" exists， its contents will be reset and overwritten.
E.
If a file named "data" exists， output will be appended to its current contents.
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【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。
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