Before doing any work on a hydraulic system equipped with accumulators, you shouldA.drain the accumulators and purge with oxygenB.bleed off all stored energy from the accumulators completelyC.charge the accumulators to prevent system energy lossD.pump the

题目

Before doing any work on a hydraulic system equipped with accumulators, you should

A.drain the accumulators and purge with oxygen

B.bleed off all stored energy from the accumulators completely

C.charge the accumulators to prevent system energy loss

D.pump the hydraulic fluid into the accumulators to prevent fluid loss

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参考答案和解析
正确答案：B
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  • 第1题：

    classFlow{publicstaticvoidmain（String[]args）{try{System.out.print（"before"）；doRiskyThing（）；System.out.print（"after"）；}catch（Exceptionfe）{System.out.print（"catch"）；}System.out.println（"done"）；}publicstaticvoiddoRiskyThing（）throwsException{//thiscodereturnsunlessitthrowsanException}}可能会产生下面哪两项结果？（）

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  • 第2题：

    现有：classFlow{publicstaticvoidmain（String[]args）try{System.out.print（"before"）；doRiskyThing（）；System.out.print（"after"）；}catch（Exceptionfe）{System.out.print（"catch"）；}System.out.println（"done"）；}publicstaticvoiddoRiskyThing（）throwsException{//thiscodereturnsunlessitthrowsanException}}可能会产生哪两项结果？（）

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  • 第4题：

    classWorkimplementsRunnable{Threadother；Work（Threadother）{this.other=other；}publicvoidrun（）{try{other.join（）；}catch（Exceptione）{}System.out.print（"afterjoin"）；}}classLaunch{publicstaticvoidmain（String[]args）{newThread（newWork（Thread.currentThread（）））.start（）；System.out.print（"afterstart"）；}}结果为：（）

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