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【单选题】
已知有预处理命令#include 和声明”char ch[10]=“Good luck.”;int i;”,要求输出字符串”Good luck.”,下面选项中不能达到该要求的语句是( )。A.
puts( ch)；
B.
printf(“ %s” ,ch[10]);
C.
for(i=0;ch[i]!=‘\0’;i++) printf(“%c”,ch[i]);
D.
for(i=0; ch[i]!=’\0’;i++) putchar( ch[i]);
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举一反三
【单选题】Structural engineering steels are sometimes found to be brittle .
A.
at high values of strain
B.
at low ambient temperatures
C.
at moderate concentrations of carbon
D.
at high ambient temperatures
【判断题】According to carbon content, the steels are classified into low-carbon, medium-carbon, and high-carbon types.
A.
正确
B.
错误
【简答题】简述电火花线切割工艺指标的主要内容。
【单选题】Case carburising process is used to achieve in steels
A.
Improve surface hardness by adding surface layers with high carbon content
B.
Decrease hardness by transforming austenite to bainite
C.
Increase hardness by transforming austenite to martensite
D.
Increase hardness by transforming austenite to pearlite
【单选题】There are two general kinds of steels: _____ steel and _____ steel.
A.
carbon, alloy;
B.
high-speed, carbon;
C.
low carbon, high carbon;
D.
alloy, stainless
【判断题】32判断 According to carbon content, the steels are classified into low-carbon, medium-carbon, and high-carbon types.
A.
正确
B.
错误
【简答题】简述电火花线切割工艺指标的主要内容
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