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纯净的、不含杂质的半导体称为本征半导体,硅(Si)和锗(Ge)是两种最常用的本征半导;以下关于半导体的说法正确的有 ( )。 A.P型半导体中掺入了微量的5价元素磷 ； B. N 型半导体中，空穴是少数载流子 ； C. P 型半导体中掺入了微量的三价元素硼 ； D. N 型半导体中，空穴是多数载流子 ；
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【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 stroke which improve engine efficiency.
D.
the engines are compact, thus providing more spaces for cargoes and passengers.
【简答题】接触悬挂包括接触线、( )、承力索和补偿器及连接零件。
【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】【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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