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【单选题】
发现儿子吸食海洛因成瘾后,便将其关在家中,并与家人轮流看守戒毒。起初,断了毒品的呼天喊地,半个月后,又恢复了正常。下列哪种说法是正确的?( )A.
已经戒断
B.
只戒断生理毒瘾
C.
只戒断心理毒瘾
D.
生理、心理的毒瘾都还没戒断
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反馈参考答案：
举一反三
【单选题】Scientists have made a new computer program ________ allows the computer to cry out for help if someone has stolen it. [ ]
A.
who
B.
which
C.
what
D.
when
【简答题】设f(x)有一个原函数 ，则 ______.
【简答题】PH 检测常用( )为正极,以( )为负极。
【单选题】A new Ezonexam switch is installed into an existing LAN and a new VTP trunk is set up with an existing switch. Which VLANs will be allowed on this new trunk?
A.
All defined VLANs are allowed on the trunk by default.
B.
Each VLAN, or VLAN range, that is specified with the switchport mode command.
C.
Each VLAN, or VLAN range, that is specified with the vtp domain command.
D.
Each VLAN, or VLAN range, that is specified with the vlan database command.
E.
None of the above
【单选题】设F(x)是函数f(x)在区间I上的原函数，则
A.
F(x)必是初等函数且有界．
B.
F(x)必是初等函数，但未必有界．
C.
F(x)在I上必连续且有界．
D.
F(x)在I上必连续，但未必有界．
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