题目内容

Robinson Crusoe had to live____wild fruits and fish on the desert island.

A. with
B. from
C. in
D. on

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He found it increasingly difficult to read,_____ he wouldn't give up.

A. and
B. for
C. but
D. or

回差(又称变差) 名词解释

Whichmethodimplementationswillwritethegivenstringtoafilenamed"file",usingUTF8encoding?()
IMPLEMENTATIONa:
publicvoidwrite(Stringmsg)throwsIOException{
FileWriterfw=newFileWriter(newFile("file"));
fw.write(msg);
fw.close();
}
IMPLEMENTATIONb:
publicvoidwrite(Stringmsg)throwsIOException{
OutputStreamWriterosw=newOutputStreamWriter(newFileOutputStream("file"),"UTF8");osw.write(msg);
osw.close();
}
IMPLEMENTATIONc:
publicvoidwrite(Stringmsg)throwsIOException{FileWriterfw=newFileWriter(newFile("file"));
fw.setEncoding("UTF8");
fw.write(msg);
fw.close();}
IMPLEMENTATIONd:
publicvoidwrite(Stringmsg)throwsIOException{FilterWriterfw=FilterWriter(newFileWriter("file"),"UTF8");
fw.write(msg);fw.close();
}
IMPLEMENTATIONe:
publicvoidwrite(Stringmsg)throwsIOException{
OutputStreamWriterosw=newOutputStreamWriter(newOutputStream(newFile("file")),"UTF8");
osw.write(msg);
osw.close();
}

管输天然气时,如果天然气中所含水分过多,会给管道运行带来什么问题?一般依靠测量哪个参数来监视含水量?采用什么仪器测量该参数,原理如何?

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