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【单选题】
在计算机中,存储容量为 2MB ,指的是A.
1024*1024*2 个字
B.
1024*1024*2 个字节
C.
1000*1000*2 个字节
D.
1000*1000*2 个字
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举一反三
【单选题】有关普通X线机管电压预示与补偿,下列说法正确的是
A.
管电压是通过在高压次级端并联一电压表测量
B.
管电压的预示是通过在高压初级电路中串联以电压表预示
C.
由于高压初级电路各元器件电阻的存在，在管电流减小时，高压初级电路会产生较大的电压降
D.
电阻式管电压补偿电路是利用电阻分压，KV表只测量高压初级端电压的一部分
【简答题】简述动态处理设备的种类及作用?
【简答题】Now you will hear an interview about preserving important life stories. Listen carefully and complete the answers to the following questions according to what you hear. u05_1.mp3: 1. What is StoryCorp...
【单选题】Now you will hear a passage. At the end of the passage, you will hear some questions. After you hear a question, choose the best answer from the four choices.
A.
She considers herself very special.
B.
She considers herself the same as others.
C.
She considers herself a confident woman.
D.
She considers herself an experienced doctor.
【多选题】以下关于串并管路计算的说法正确的是()
A.
串联管路的总损失等于各管段损失之和。
B.
串联管路的总阻抗等于各管段的阻抗之和。
C.
并联管路的总阻抗等于各支管的阻抗。
D.
并联管路各并联管段的水头损失相等。
【单选题】Now you will hear a passage. At the end of the passage, you will hear some questions. After you hear a question, choose the best answer from the four choices.
A.
She lost an arm and a leg.
B.
She began to live a normal life.
C.
She moved to China with her family.
D.
She almost died from a serious disease.
【单选题】Now you will hear a passage. At the end of the passage, you will hear some questions. After you hear a question, choose the best answer from the four choices.
A.
Because she had strong anxiety to help patients.
B.
Because she would not let others see her missing limbs.
C.
Because an admissions officer thought she couldn’t be a doctor.
D.
Because admissions officers refused to give reasons to reject her.
【多选题】关于管路特性阻力，以下说法正确的是（）。
A.
串联管路的总特性阻力系数大于任何一段分管段的特性阻力系数
B.
并联管路的总特性阻力系数小于任何一段分管段的特性阻力系数
C.
管路特性阻力系数与管径和管长无关
D.
管路特性阻力系数与流体种类无关
【多选题】关于下列串联型控制器工作方式说法正确的有( )
A.
当蓄电池充满电后，开关S1断开。
B.
在此电路中VD1二极管可以不需要。
C.
当蓄电池放完电后开关S2断开。
D.
与并联型控制器的电路结构相似，区别仅仅是将开关器件S1由并联在太阳能电池输出端改为串联在蓄电池充电回路中。
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