5、以下Java程序段,有错误的行是()。(1) class HelloWorld {(2)public static void main( String[] args ) {(3)System.out.println( "你好!Java" );(4)}(5)}
A. 第2行,main首字母要大写
B. 第1行,class前缺少关键字public
C. 第3行,System要小写
D. 第3行,语句结尾的分号要去掉
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运动生理学家把()的运动强度定位健康价值阈的上限。
A. 160次/min
B. 170次/min
C. 180次/min
D. 200次/min