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【单选题】
三相半波可控整流电路，电阻性负载，段电压输出。但由于某种故障，在图中所示负载电压丢失了一段，则该故障现象产生的原因可能是以下哪种情况？此时触发角为多少？【图片】
A.
A相晶闸管断开或触发电路故障；α=30°
B.
A相晶闸管断开或触发电路故障；α=60°
C.
B相晶闸管断开或触发电路故障；α=30°
D.
B相晶闸管断开或触发电路故障；α=60°
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参考答案：
举一反三
【单选题】The student tried every means to ____________ what the teacher was teaching in class, but failed.
A.
grip
B.
seize
C.
grasp
D.
snatch
查看完整题目与答案
【单选题】Experts advise us to learn which means not depending on the book or the teacher.
A.
sincerely
B.
immediately
C.
intelligently
D.
independently
查看完整题目与答案
【单选题】“鼻道窦口复合体(OMC)”由——首先提出( )
A.
Messerklinger
B.
Kennedy
C.
Wigand
D.
Naumann
E.
以上都不是
查看完整题目与答案
【单选题】窦口鼻道复合体（OMC）由（）首先提出。
A.
Messerklinger
B.
Kennedy
C.
Wigand
D.
Naumann
E.
以上都不是
查看完整题目与答案
【单选题】不属于蛋白质起泡的必要条件是()
A.
在界面形成粘弹性较好
B.
蛋白质充分伸展和吸附
C.
蛋白质在气液界面吸附形成保护膜
D.
具有较高的蛋白质浓度
查看完整题目与答案
【单选题】种梨的地方海拔()。
A.
越高越好
B.
越低越好
C.
和海拔无关
D.
视品种而定
查看完整题目与答案
【单选题】If students find it difficult to start talking in a task where they have to choose one of five places to go for an outing, the teacher may tell them to consider distance, means of transport, time avai...
A.
controller
B.
assessor
C.
organizer
D.
prompter
查看完整题目与答案
【简答题】Think about the situations where we are likely to hear the question: “Why don’t you close the door?” A student just came into the classroom and left the door open. The teacher says this to the student...
查看完整题目与答案
【单选题】"He didn't know how to answer the question the teacher asked so he had to speculate abou t the answer." The underlined part means_______.
A.
focus on
B.
reason
C.
guess
D.
ask for
查看完整题目与答案
【多选题】不属于蛋白质起泡的必要条件是()
A.
蛋白质在气-液界面吸附形成保护膜
B.
需要一定温度和搅打
C.
在界面形成黏弹性较好的蛋白质膜
D.
具有较高的蛋白质浓度
查看完整题目与答案
相关题目：
【单选题】The student tried every means to ____________ what the teacher was teaching in class, but failed.
A.
grip
B.
seize
C.
grasp
D.
snatch
查看完整题目与答案
【单选题】Experts advise us to learn which means not depending on the book or the teacher.
A.
sincerely
B.
immediately
C.
intelligently
D.
independently
查看完整题目与答案
【单选题】“鼻道窦口复合体(OMC)”由——首先提出( )
A.
Messerklinger
B.
Kennedy
C.
Wigand
D.
Naumann
E.
以上都不是
查看完整题目与答案
【单选题】窦口鼻道复合体（OMC）由（）首先提出。
A.
Messerklinger
B.
Kennedy
C.
Wigand
D.
Naumann
E.
以上都不是
查看完整题目与答案
【单选题】不属于蛋白质起泡的必要条件是()
A.
在界面形成粘弹性较好
B.
蛋白质充分伸展和吸附
C.
蛋白质在气液界面吸附形成保护膜
D.
具有较高的蛋白质浓度
查看完整题目与答案
【单选题】种梨的地方海拔()。
A.
越高越好
B.
越低越好
C.
和海拔无关
D.
视品种而定
查看完整题目与答案
【单选题】If students find it difficult to start talking in a task where they have to choose one of five places to go for an outing, the teacher may tell them to consider distance, means of transport, time avai...
A.
controller
B.
assessor
C.
organizer
D.
prompter
查看完整题目与答案
【简答题】Think about the situations where we are likely to hear the question: “Why don’t you close the door?” A student just came into the classroom and left the door open. The teacher says this to the student...
查看完整题目与答案
【单选题】"He didn't know how to answer the question the teacher asked so he had to speculate abou t the answer." The underlined part means_______.
A.
focus on
B.
reason
C.
guess
D.
ask for
查看完整题目与答案
【多选题】不属于蛋白质起泡的必要条件是()
A.
蛋白质在气-液界面吸附形成保护膜
B.
需要一定温度和搅打
C.
在界面形成黏弹性较好的蛋白质膜
D.
具有较高的蛋白质浓度
查看完整题目与答案
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