The school rules state that no child shall be allowed out of the school during the day, ______ accompanied by an adult.

A． once

B． when

C． if

D． unless

[单选题]It is verydifficult for a child to [adhere to] rules.A.rememberB.followC.un

[单选题]The State Council will lay down new rules that aim to make management compa

[问答题]Law is the system of state-enforced rules by which relatively large civil s

[单选题]Some rules are almost the same _______in the world, but rules of etiquette can be different from place to place.A． somewhere B. anywhere C. nowhere D. everywhere

[单选题]Network software consists of( )，or rules by which processes can communicate．A．protocolsB．programsC．devicesD．computers

[名词解释] delirium state

[单选题] One of the basic rules of computer security is to change your （73） regularly.（73）A． nameB． computerC． deviceD． password

[单选题] One of the basic rules of computer security is to change your（73） regularly.（73）A． nameB． computerC． passwordD． device

[单选题]One of the basic rules of computer security is to change your(73)regularly．A．nameB．computerC．deviceD．password

[单选题]One of the basic rules of computer security is to change your ______ regularly.A．nameB．computerC．deviceD．PasswordA．B．C．D．