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【简答题】
静电场的电场强度为E，电场存在区域内介质的介电常数为ε，该静电场的能量密度为w e =（），整个区域静电场所储存的能量为W e =（）。
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【简答题】接触悬挂包括接触线、( )、承力索和补偿器及连接零件。
【简答题】接触悬挂包括承力索、吊弦和( )
【单选题】Medium-speed engines have the following advantages except
A.
medium-speed engines use less oil than slow-speed engines
B.
medium-speed engines of later type are capable of burning low quality heavy fuel oil
C.
the engines have long strokes which improve engine efficiency
D.
the engines are compact， thus providing more spaces for cargoes and passengers
【简答题】下面的程序使用冒泡排序法对数组a中的10个数从小到大进行排序。 #include void main() { int a[10]={30,21,23,32,56,78,90,22,78,89},i,j,t; for(i=0;i<=9;i++) for(j=0; ;j++) if( ) { t=a[j]; ; a[j+1]=t; } printf("排序后的结果是:\n"); for(i=0;i...
【单选题】Medium-speed engines have the following advantages except:
A.
medium-speed engines use less oil than slow-speed engines
B.
medium-speed engines of later type are capable of burning low quality heavy fuel
C.
the engines have long strokes which improve engine efficiency
D.
the engines are compact, thus providing more spaces for cargoes and passengers
【单选题】根据《合同法》的规定：“合同解除后，对已经履行的部分，根据履行情况和合同性质，当事人可以要求恢复原状、采取其他补救措施，并有权要求赔偿损失。”其中的恢复原状是指恢复到( )的状态。
A.
合同订立前
B.
合同解除前
C.
合同终止前
D.
合同撤销前
【单选题】【单选】 Medium speed engines have the following advantages except _____
A.
Medium speed engines use less oil then than slow speed engines.
B.
Medium speed engines of later type are capable of burning low quality heavy fuel oil.
C.
The engines have long strokes improve engine efficiency,
D.
The engines are compact, thus providing more spaces for cargoes and passengers.
【简答题】接触悬挂包括( )、( )、( )和( )。
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