答案:D
给煤机皮带打滑或皮带跑偏、损坏的原因:a)给煤机皮带过松、张力小;b)给煤机皮带与滚筒间()。
下列程序的输出结果是( )。 #include<iostream.h> void main( ) { char * str="12123434"; int x1=0,x2=0,x3=0,x4=0,i; for(i=0;str[i]!=’’\0’’;i++) switch(str[i]) { case’’1’’:x4++; case’’2’’:x3++; case’’3’’:x2++; case’’4’’:x1++; } cout < < x1 < < "," < < x2 < < "," < < x3 < < "," < < x4;
A.0
B.1
C.2
D.3