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启动Session会话的函数是

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将用户名"admin"保存到session变量为"username"的写法是

将用户名"admin"保存到session变量的写法正确的是

A. session['username']="admin"
B. $_session['username']="admin"
C. $_Session['username']="admin"
D. $_SESSION['username']="admin"

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销毁$_SESSION['username']写法正确的是

A. $_SESSION['admin']=null
B. unset($_SESSION['admin'])
C. $_SESSION['admin']=""
D. $_SESSION['']

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What is wrong about peristalsis?

A. Its plural form is peristalses.
B. It is stimulated by the nerves in the surrounding esophageal tissue.
C. It is a series of defined cartilaginous contractions.
D. It propels the food into the stomach.

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