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搜题
【单选题】
液压缸差动连接工作时的作用力是( )。A.
p*pi*d*d/4
B.
p*pi*(D*D-d*d)/4
C.
p*pi*d*d/2
D.
p*pi*(D*D-d*d)/2
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举一反三
【单选题】变量$email的值是字符串user@example.com,以下哪项能把字符串转化成example.com?
A.
substr($email, strpos($email, "@"));
B.
strstr($email, "@");
C.
strchr($email, "@");
D.
substr($email, strpos($email, "@")+1);
E.
strrpos($email, "@");
【单选题】变量$email的值是字符串user@example.com,以下哪项能把字符串转化成 example.com
A.
substr($email, "@");
B.
strtok($email,“@”);
C.
$b=strtok($email,"@"); $i=strlen($b); $c=substr($email,$i+1);
D.
str_replace("@","",$email);
【单选题】变量$email的值是字符串user@example.com，以下哪项能把字符串转化成example.com?
A.
substr($email, strpos($email, “@”))
B.
strstr($email, “@”)
C.
strchr($email, “@”)
D.
substr($email, strpos($email, “@”)+1);
【单选题】变量$email的值是字符串user@example.com,以下选项()能把字符串转化成example.com。
A.
substr($email, strpos($email, "@"));
B.
strstr($email, "@");
C.
strchr($email, "@");
D.
substr($email, strpos($email, "@")+1);
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