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【多选题】
检修后的变频器，现准备进入调校工作，接线已检查正确无误，请你选出内部操作模式校验的正确步骤（）
A.
将380V电源装置电压调整到380V，基频设置为50Hz，基压设置为380V；变频器运行方式切换到内部操作模式，通过操作单元设置运行频率为10Hz
B.
在变频器STF（STR）端和公共端之间连接一试验按钮；按STF（STR）和公共端之间试验按钮，此时电机应正（反）转，松开按钮，电机应即停止
C.
按正转（反转）键，电机应按一定转速朝正向（反向）旋转，记录此时电机转速（拆算成变频器实际输出频率）及电压
D.
按上述方法分别将运行频率设置为（20、30、35、40、45、50、60）Hz，记录电机转速及电压；计算变频器频率输出误差应符合变频器技术要求，输出电压变化在允许范围内
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参考答案：
举一反三
【单选题】— I just can’t stop worrying about the school results of the midterm examination. — _______. There is nothing you can do now but study hard, keep calm and do your best.
A.
Relax
B.
Go ahead
C.
Go for it
D.
Good luck
查看完整题目与答案
【单选题】下列不属于败酱科的药用植物有( )
A.
忍冬
B.
缬草
C.
黄花败酱
D.
甘松
查看完整题目与答案
【单选题】Why does US Congress launch federal investigation against Tik Tok?
A.
They fear that TikTok may force Facebook and other social media out of business.
B.
They fear that TikTok may have illegal data-collecting and censorship by foreign government and may interfere US internal affairs.
C.
They fear that TikTok is controlled by several US senator to cheat in US election.
D.
They fear that TikTok may be used by Russian government to interfere US election.
查看完整题目与答案
【单选题】Tik Tok is one of the funniest APPs on the Internet so far.
A.
finding
B.
being found
C.
to find
D.
found
查看完整题目与答案
【单选题】秋季常见的皮肤问题不包括（）。
A.
痤疮
B.
瘙痒
C.
红斑
D.
丘疹
查看完整题目与答案
【单选题】没有外部存贮器的计算机,其监控程序可以存放在( )。
A.
RAM
B.
ROM
C.
CPU
D.
RAM和ROM
查看完整题目与答案
【判断题】Youtube, Pinterest, and Tik Tok(抖音)are all major social marketing players.
A.
正确
B.
错误
查看完整题目与答案
【判断题】病毒性营销就是以传播病毒的方式展开营销。
A.
正确
B.
错误
查看完整题目与答案
【单选题】51单片机扩展行列式按键,1个并行口最多可以扩展8个按键。
A.
4
B.
8
C.
16
D.
64
查看完整题目与答案
【单选题】—Can you ______ a car? —No, I can't. I just know how to ______ a bicycle. [     ]
A.
take, drive
B.
take, ride
C.
drive, ride
D.
drive, take
查看完整题目与答案
相关题目：
【单选题】— I just can’t stop worrying about the school results of the midterm examination. — _______. There is nothing you can do now but study hard, keep calm and do your best.
A.
Relax
B.
Go ahead
C.
Go for it
D.
Good luck
查看完整题目与答案
【单选题】下列不属于败酱科的药用植物有( )
A.
忍冬
B.
缬草
C.
黄花败酱
D.
甘松
查看完整题目与答案
【单选题】Why does US Congress launch federal investigation against Tik Tok?
A.
They fear that TikTok may force Facebook and other social media out of business.
B.
They fear that TikTok may have illegal data-collecting and censorship by foreign government and may interfere US internal affairs.
C.
They fear that TikTok is controlled by several US senator to cheat in US election.
D.
They fear that TikTok may be used by Russian government to interfere US election.
查看完整题目与答案
【单选题】Tik Tok is one of the funniest APPs on the Internet so far.
A.
finding
B.
being found
C.
to find
D.
found
查看完整题目与答案
【单选题】秋季常见的皮肤问题不包括（）。
A.
痤疮
B.
瘙痒
C.
红斑
D.
丘疹
查看完整题目与答案
【单选题】没有外部存贮器的计算机,其监控程序可以存放在( )。
A.
RAM
B.
ROM
C.
CPU
D.
RAM和ROM
查看完整题目与答案
【判断题】Youtube, Pinterest, and Tik Tok(抖音)are all major social marketing players.
A.
正确
B.
错误
查看完整题目与答案
【判断题】病毒性营销就是以传播病毒的方式展开营销。
A.
正确
B.
错误
查看完整题目与答案
【单选题】51单片机扩展行列式按键,1个并行口最多可以扩展8个按键。
A.
4
B.
8
C.
16
D.
64
查看完整题目与答案
【单选题】—Can you ______ a car? —No, I can't. I just know how to ______ a bicycle. [     ]
A.
take, drive
B.
take, ride
C.
drive, ride
D.
drive, take
查看完整题目与答案
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