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【多选题】
如图 6 所示电路中的变压器为理想变压器, S 为单刀双掷开关. P 是滑动变阻器 R 的滑动触头, U 1 为加在原线圈两端的交变电压, I 1 、 I 2 分别为原线圈和副线圈中的电流.下列说法正确的是 ( )
A.
.保持 P 的位置及 U 1 不变, S 由 b 切换到 a ,则 R 上消耗的功率减小
B.
.保持 P 的位置及 U 1 不变, S 由 a 切换到 b ,则 I 2 减小
C.
.保持 P 的位置及 U 1 不变, S 由 b 切换到 a ,则 I 1 增大
D.
.保持 U 1 不变, S 接在 b 端,将 P 向上滑动,则 I 1 减小
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参考答案：
举一反三
【单选题】铸造高速钢铣刀毛坯，适宜采用的铸造方法是()。
A.
砂型铸造
B.
金属型铸造
C.
熔模铸造
D.
压力铸造
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【多选题】As a speaker, what can you do to help your audience listen to you?
A.
Show your audience that you are an “expert” by adding a lot difficult information in your speech.
B.
Tell some jokes or slow down to help your audience focus.
C.
Speak fast to show your fluency.
D.
Make your speech clear and easy enough for your audience.
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【单选题】牙科铸造属于( )。
A.
陶瓷型芯铸造
B.
精密芯块铸造
C.
石膏型铸造
D.
金属型铸造
E.
熔模铸造
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【单选题】铸造双金属轴承，适宜采用的铸造方法是( )。
A.
熔模铸造
B.
砂型铸造
C.
压力铸造
D.
离心铸造
查看完整题目与答案
【简答题】Fill in the blanks with the expressions given below. Change the form where necessary be bound to major in expose to stand up for capture one’s imagination be described as be available to b...
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【单选题】铸造小型柴油机曲轴，适宜采用的铸造方法是( )。
A.
压力铸造
B.
离心铸造
C.
砂型铸造
D.
金属型铸造
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【单选题】关于心跳骤停紧急处理原则,下列哪项是错误的( )
A.
迅速开始人工呼吸
B.
待心电图确诊后开始胸外心脏按压
C.
立即开放静脉输液通道
D.
立即开始胸外心脏按压
E.
准备好电极除颤
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【单选题】Why do you want to capture your audience’s attention in your introduction?
A.
All of the answers are correct.
B.
Because it provides motivation for the audience to pay attention.
C.
Because it makes your presentation more exciting.
D.
Because it helps create a bond between you and the audience.
查看完整题目与答案
【单选题】Which of the following is the most effective way to establish a trust bond with your audience?
A.
Telling your audience you are nervous
B.
Trying to be yourself
C.
Flattering your audience
D.
Telling your audience you are happy
查看完整题目与答案
【简答题】English-Chinese Translation 1. Half of the financial institutions of thiscountry paralyzed, its currency devalued by more than 40% percent, and itsforeign reserves exhausted, the country is unlikely t...
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相关题目：
【单选题】铸造高速钢铣刀毛坯，适宜采用的铸造方法是()。
A.
砂型铸造
B.
金属型铸造
C.
熔模铸造
D.
压力铸造
查看完整题目与答案
【多选题】As a speaker, what can you do to help your audience listen to you?
A.
Show your audience that you are an “expert” by adding a lot difficult information in your speech.
B.
Tell some jokes or slow down to help your audience focus.
C.
Speak fast to show your fluency.
D.
Make your speech clear and easy enough for your audience.
查看完整题目与答案
【单选题】牙科铸造属于( )。
A.
陶瓷型芯铸造
B.
精密芯块铸造
C.
石膏型铸造
D.
金属型铸造
E.
熔模铸造
查看完整题目与答案
【单选题】铸造双金属轴承，适宜采用的铸造方法是( )。
A.
熔模铸造
B.
砂型铸造
C.
压力铸造
D.
离心铸造
查看完整题目与答案
【简答题】Fill in the blanks with the expressions given below. Change the form where necessary be bound to major in expose to stand up for capture one’s imagination be described as be available to b...
查看完整题目与答案
【单选题】铸造小型柴油机曲轴，适宜采用的铸造方法是( )。
A.
压力铸造
B.
离心铸造
C.
砂型铸造
D.
金属型铸造
查看完整题目与答案
【单选题】关于心跳骤停紧急处理原则,下列哪项是错误的( )
A.
迅速开始人工呼吸
B.
待心电图确诊后开始胸外心脏按压
C.
立即开放静脉输液通道
D.
立即开始胸外心脏按压
E.
准备好电极除颤
查看完整题目与答案
【单选题】Why do you want to capture your audience’s attention in your introduction?
A.
All of the answers are correct.
B.
Because it provides motivation for the audience to pay attention.
C.
Because it makes your presentation more exciting.
D.
Because it helps create a bond between you and the audience.
查看完整题目与答案
【单选题】Which of the following is the most effective way to establish a trust bond with your audience?
A.
Telling your audience you are nervous
B.
Trying to be yourself
C.
Flattering your audience
D.
Telling your audience you are happy
查看完整题目与答案
【简答题】English-Chinese Translation 1. Half of the financial institutions of thiscountry paralyzed, its currency devalued by more than 40% percent, and itsforeign reserves exhausted, the country is unlikely t...
查看完整题目与答案
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