Why did Zeus’ wife, Hera gave punishment to Echo by making her unable to speak complete sentences but the last two words spoken to her? A: Because Hera was jealous of Echo’s beauty. B: Because Echo fell in love with Narcissus. C: Because Echo had helped Zeus hiding his affairs with other nymphs. D: Because Zeus fell in love with Echo.

echo (45==45); echo' '; echo (45=="45"); echo " "; echo (45==="45"); 结果是

The normal echo of the spleen is ( ) A: Strong echo B: No echo C: High echo D: Moderate echo is slightly lower than liver

显示用户的主目录的命令是( )。 A: echo $HOME B: echo $USERDIR C: echo $ENV D: echo $ECHO

显示用户的主目录的命令是什么（ ）。 A: echo $HOME B: echo $USERDIR C: echo $ECHO D: echo $ENV

程序运行输出结果： <?php echo 12.3 % 5.2; echo 12 % 5; echo -12 % 5; echo -12 % -5; echo 12 % -5; ?>

下列shell脚本中的case语句，语法正确的是（） A: case $1 in 1) echo "Monday" ;; 2) echo "Tuesday" ;; *) echo "Input error" ;; B: case $1 in 1) echo "Monday" ; 2) echo "Tuesday" ; *) echo "Input error" ; C: case $1 in 1) echo "Monday" ;; 2) echo "Tuesday" ;; *) echo "Input error" ;; esac D: case $1 in 1) echo "Monday" ;; 2) echo "Tuesday" ;; *) echo "Input error" ;; end

以下程序运行结果是： <?php echo ceil(0.6)."&nbsp"; echo ceil(0.4)."&nbsp"; echo ceil(5)."&nbsp"; echo ceil(5.1)."&nbsp"; echo ceil(-5.1)."&nbsp"; echo ceil(5.9)."&nbsp"; ?>

显示用户主目录的命令是什么？ A: echo $HOME B: echo $USRDIR C: echo HOME D: echo $env

Linux系统中,如何在系统文档中找到关于echo这个命令的所有说明 A: man echo B: which echo C: locate echo D: apropos echo