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【单选题】
住宅室内的空气污染物中,氡的活度和浓度最高不应大于( )。A.
100Bq/m ³
B.
200Bq/m ³
C.
300Bq/m ³
D.
400Bq/m ³
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反馈参考答案：
举一反三
【单选题】通常用户进程被建立后 ( ) 。
A.
便一直存在于系统中，直到被操作人员撤销
B.
随着进程运行的正常或不正常结束而撤销
C.
随着时间片轮转而撤销与建立
D.
随着进程的阻塞或者唤醒而撤销与创建
【单选题】When the hospital learned that Laura was missing, they _________.
A.
informed her family by writing them a letter saying Laura had left the hospital
B.
declared that Laura was no longer their responsibility since she had left without their permission
C.
referred her family to the police department because searching for a missing person was the job of the police
D.
realized that Laura was determined to commit suicide
【单选题】When Laura committed suicide, the writer realized that _________.
A.
she had been too naive in thinking that all people had a caring heart for others
B.
her lack of understanding of her sister's suffering had led to her sister's death
C.
her neglect of Laura had made Laura very depressed
D.
the chronic mental disease Laura had would make Laura turn to suicide in moments of depression
【多选题】当劳动力市场上工资率和就业量的波动趋于均衡点时,应具备的条件有( )
A.
劳动力供给弹性小于劳动力需求弹性
B.
劳动力供给弹性大于劳动力需求弹性
C.
劳动力供给弹性等于劳动力需求弹性
D.
劳动力供给曲线比需求曲线更为陡峭
E.
劳动力供给曲线比需求曲线更为平缓
【单选题】通常用户进程被建立后( )。
A.
便一直存在与系统中，直到被操作人员撤销
B.
随着进程运行的正常或不正常结束而撤销
C.
随着时间片轮转而撤销与建立
D.
随着进程的阻塞或者唤醒而撤销与建立
【单选题】通常用户进程被建立后( )。
A.
便一直存在于系统中，直到被操作人员撤销
B.
随着进程运行的正常或不正常结束而撤销
C.
随着时间片轮转而撤销与建立
D.
随着进程的阻塞或者唤醒而撤销与建立
【单选题】通常用户进程被建立后,( )
A.
便一直存在于操作系统，直到被操作人员撤销
B.
随着作业运行正常或不正常结束而撤销
C.
随着时间片轮转而撤销与建立
D.
随着进程的阻塞或唤醒而撤销与建立
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