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【多选题】
对行业协会或者组织领头逐渐的中小企业采购联盟运作模式描述正确的是( )A.
中小企业没有参与采购具体操作，很难掌握采购信息
B.
行业协会的官商作风影响采购效率
C.
行业协会很难有效对中小企业多变性做出迅速反应
D.
采购联盟随意性较大
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举一反三
【单选题】Tom Williams arrives at Beijing Capital International Airport. He calls his friend,( 1 )
A.
Dr. Nan
B.
Dr. An
C.
Dr. Wan
【单选题】Tom Williams arrives at Changdong Airport. He calls his friend_________
A.
Dr. Nan
B.
Dr. An
C.
Dr. Wan
【单选题】Tom Williams arrives at Beijing Capital International Airport. He calls his friend, ( ).
A.
Dr. An
B.
Dr. Nan
C.
Dr. Wan
【简答题】我国工农业生产和生活照明用电电压是____V,其最大值____V;周期T= ____s,频率f= ____Hz,角频率ω=____rad/s
【单选题】Tom Williams arrives at Beijing Capital International Airport. He calls his friend___________.
A.
Dr. Nan
B.
Dr. An
C.
Dr. Wan
【单选题】一个育龄妇女婚前检查，风疹IgG抗体阴性。婚后育龄妇女准备要小孩，但当地每年都有风疹散在流行。为防止先天性风疹综合征发生的最好办法是（）。
A.
该育龄妇女不接触出疹的病人
B.
注射风疹减毒活疫苗，并在3～6个月后再怀孕
C.
推迟1年怀孕
D.
保持家中空气流通和空气消毒
E.
注射丙种球蛋白和胎盘球蛋白
【单选题】Tom Williams arrives at Changdong Airport. He calls his friend, 1 Dr. Nan, Dr. An, Dr. Wan . His friend is surprised by his 2 late, early, punctual arrival. She is going to pick him up at the 3 airpo...
A.
late
B.
early
C.
punctual
【单选题】Tom Williams arrives at Changdong Airport. He calls his friend, 1 Dr. Nan, Dr. An, Dr. Wan . His friend is surprised by his 2 late, early, punctual arrival. She is going to pick him up at the 3 airpo...
A.
airport
B.
hotel
C.
office
【单选题】Tom Williams arrives at Changdong Airport. He calls his friend, 1 Dr. Nan, Dr. An, Dr. Wan . His friend is surprised by his 2 late, early, punctual arrival. She is going to pick him up at the 3 airpo...
A.
five-minute, ten-minute, fifteen-minute
B.
ten-minute
C.
fifteen-minute
【简答题】并联于无限大电网运行的隐极同步发电机，原来发出一定的有功功率和电感性无功功率，若保持有功输出不变，仅调节励磁电流I f 使之减小，问 和 各按什么轨迹变化?功角θ如何变化?要保持稳定运行，I f 能否无限减小(忽略电枢电阻)?
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