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【单选题】
若函数f（x）=x 2 +2x+a没有零点，则实数a的取值范围是（ ）A.
a＜1
B.
a＞1
C.
a≤1
D.
a≥1
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举一反三
【多选题】房地产经纪机构直线一参谋制组织结构形式的特点有( )。
A.
各层次管理者配备职能机构或人员，充当同级管理者的参谋和助手
B.
配备的职能机构或人员对下级管理者无指挥权
C.
可以聘用专家，发挥他们的专长，弥补管理者之不足，且减轻管理者的负担职能
D.
部门和人员一般是按职能业务的性质分工，分别从事专业化管理
E.
直线一参谋制组织结构形式保证了管理者的统一指挥，避免了多头领导
【单选题】第一篇 First Aid First aid is emergency care for a victim of sudden illness or injury until more skillful medical treatment is available. It may save a life or improve certain vital signs including pulse...
A.
saving a victim's life.
B.
preventing a victim's condition from getting worse.
C.
helping a person avoid sudden illness or injury.
D.
relieving a victim from pain.
【单选题】First Aid First aid is emergency care for a victim of sudden illness or injury until mere skillful medical treatment is available, it may save a life or improve certain vital signs including pulse, te...
A.
saving a victim's life.
B.
preventing a victim's condition from getting worse.
C.
helping a person avoid sudden illness or injury.
D.
relieving a victim from pain.
【简答题】国内的调度集中系统由 、车站子系统和网络子系统三部分组成。A. 调度中心子系统
【单选题】First Aid First aid is emergency care for a victim of sudden illness or injury until more skillful medical treatment is available. It may save a life or improve certain vital signs including pulse, te...
A.
saving a victim’s life.
B.
preventing a victim’s condition from getting worse.
C.
relieving a victim from pain.
D.
helping a person avoid sudden illness or injury
【单选题】First Aid First aid is emergency care for a victim of sudden illness or injury until more skillful medical treatment is available. It may save a life or improve certain vital signs including pulse, te...
A.
saving a victim's life.
B.
preventing a victim's condition from getting worse.
C.
helping a person avoid sudden illness or injury.
D.
relieving a victim from pain.
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