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【单选题】
有源逆变电路和无源逆变电路的区别在于?
A.
交流侧如果接电网就是有源逆变，交流侧如果接负载就是无源逆变。
B.
交流侧如果接电网就是无源逆变，交流侧如果接负载就是有源逆变。
C.
有源逆变电路中有电源和无源逆变电路中没有电源。
D.
有源逆变电路中没有电源和无源逆变电路中有电源。
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参考答案：
举一反三
【简答题】Questionnaire on Hair Care Products Dear Sir/ Madam , Thank you for completing this questionnaire. Your feedback will be of great help to us. After finishing the questionnaire, please hand it ba...
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【简答题】How long does it take to go to central London from Queen's Hote17 [A]5 stops by bus. [B]15 minutes by car. [C]A few minutes' walk. [D]A few stops by underground.
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【单选题】某建设工程实行项目总承包,其中某设备的暂估价为1000万元,则该设备的招标由谁负责。
A.
建设单位
B.
项目总承包单位
C.
建设单位和项目总承包单位
D.
建设单位或项目总承包单位
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【单选题】()HTML5 内建对象用于在画布上绘制
A.
getContent
B.
getContext
C.
getGraphics
D.
getCanvas
查看完整题目与答案
【多选题】食品污染的防范措施有
A.
包装物料存放库要保持干燥、 清洁、通风、防霉，内外包装分别存放，上有盖布，下有垫板，并设有防虫鼠设施
B.
对灯具加装防护罩，将易脱落碎片的器具更换为耐腐蚀、易清洗的不锈钢器具
C.
加工设备上的润滑油选用食用级的，对有毒、有害的化学品严格管理
D.
保持车间的良好通风和适宜温度，顶棚呈圆弧形，尽量缩小温差，有效控制水滴和冷凝水的形成
查看完整题目与答案
【单选题】目前大多数俱乐部属于体委与企业联办,少数属于私人、()、国有企业独资办。
A.
集体
B.
政府
C.
公益
D.
董事会
查看完整题目与答案
【单选题】CCK对胰液分泌的作用是()
A.
促进酶分泌
B.
促进无机盐分泌
C.
抑制作用
D.
无影响
查看完整题目与答案
【单选题】第19篇 下面文章中有5处需要添加小标题。请从以下选项中选出符合各段意思的小标题。
A.
What will you do if your hair or clothes start to burn?
B.
Don’t open a hot door!
C.
Make escape plans.
D.
Practice for a fire.
E.
Put a smoke alarm in the house People know the dangers of fires. It’s good for a family to learn how toprepare for a fire. Here are some suggestions: 1 . Smoke from a fire causes the alarm (报警) to go off .Thealarm makes a loud sound. The sound tells everyone to leave the house at once. 2 . They should know all the ways out of the house. Ifthere is a fire, everyone follows the plan to get out. Part of the plan is tocheck all the windows to make sure they can be opened easily (容易地). Buy fire extinguishers ( 灭火器) in the house, Everyone in the family should knowhow to use them. 3 . They do fire practice because they teach childrenabout fire safety. Everyone in the family should know the following fire rules: 4 . The fire can grow more quickly if youopen the door. Stay close to the floor! Smoke can be more dangerous than fire,The best air is near the floor because smoke rises( 上升). 5 . First, stop! Don’t run! The fire burns faster becauseof more air. Drop! Fall to the floor. Then roll (滚动)! Turning over and over will makethe fire go out. Put a blanket (毯子) around you to keepair away from the fire that may still be on you. A clever family is ready all the time. If there is a fire, don’t forgetto call 119 for help.
查看完整题目与答案
【单选题】Speaker A: _____________________________________ Speaker B: He ’ s a manager in the hote l.
A.
What ’ s your brother?
B.
What does your brother do?
C.
Both A and B
查看完整题目与答案
【多选题】食品污染的防范措施有（ ）。
A.
持车间的良好通风和适宜温度，顶棚呈圆弧形，尽量缩小温差，有效控制水滴和冷凝水的形成
B.
对灯具加装防护罩，将易脱落碎片的器具更换为耐腐蚀、易清洗的不锈钢器具
C.
加工设备上的润滑油选用食用级的，对有毒、有害的化学品严格管理
D.
包装物料存放库要保持干燥、 清洁、通风、防霉，内外包装分别存放，上有盖布，下有垫板，并设有防虫鼠设施
E.
食品的储存库保持卫生良好，不同产品、原料、成品分别存放，设有防鼠设施
查看完整题目与答案
相关题目：
【简答题】Questionnaire on Hair Care Products Dear Sir/ Madam , Thank you for completing this questionnaire. Your feedback will be of great help to us. After finishing the questionnaire, please hand it ba...
查看完整题目与答案
【简答题】How long does it take to go to central London from Queen's Hote17 [A]5 stops by bus. [B]15 minutes by car. [C]A few minutes' walk. [D]A few stops by underground.
查看完整题目与答案
【单选题】某建设工程实行项目总承包,其中某设备的暂估价为1000万元,则该设备的招标由谁负责。
A.
建设单位
B.
项目总承包单位
C.
建设单位和项目总承包单位
D.
建设单位或项目总承包单位
查看完整题目与答案
【单选题】()HTML5 内建对象用于在画布上绘制
A.
getContent
B.
getContext
C.
getGraphics
D.
getCanvas
查看完整题目与答案
【多选题】食品污染的防范措施有
A.
包装物料存放库要保持干燥、 清洁、通风、防霉，内外包装分别存放，上有盖布，下有垫板，并设有防虫鼠设施
B.
对灯具加装防护罩，将易脱落碎片的器具更换为耐腐蚀、易清洗的不锈钢器具
C.
加工设备上的润滑油选用食用级的，对有毒、有害的化学品严格管理
D.
保持车间的良好通风和适宜温度，顶棚呈圆弧形，尽量缩小温差，有效控制水滴和冷凝水的形成
查看完整题目与答案
【单选题】目前大多数俱乐部属于体委与企业联办,少数属于私人、()、国有企业独资办。
A.
集体
B.
政府
C.
公益
D.
董事会
查看完整题目与答案
【单选题】CCK对胰液分泌的作用是()
A.
促进酶分泌
B.
促进无机盐分泌
C.
抑制作用
D.
无影响
查看完整题目与答案
【单选题】第19篇 下面文章中有5处需要添加小标题。请从以下选项中选出符合各段意思的小标题。
A.
What will you do if your hair or clothes start to burn?
B.
Don’t open a hot door!
C.
Make escape plans.
D.
Practice for a fire.
E.
Put a smoke alarm in the house People know the dangers of fires. It’s good for a family to learn how toprepare for a fire. Here are some suggestions: 1 . Smoke from a fire causes the alarm (报警) to go off .Thealarm makes a loud sound. The sound tells everyone to leave the house at once. 2 . They should know all the ways out of the house. Ifthere is a fire, everyone follows the plan to get out. Part of the plan is tocheck all the windows to make sure they can be opened easily (容易地). Buy fire extinguishers ( 灭火器) in the house, Everyone in the family should knowhow to use them. 3 . They do fire practice because they teach childrenabout fire safety. Everyone in the family should know the following fire rules: 4 . The fire can grow more quickly if youopen the door. Stay close to the floor! Smoke can be more dangerous than fire,The best air is near the floor because smoke rises( 上升). 5 . First, stop! Don’t run! The fire burns faster becauseof more air. Drop! Fall to the floor. Then roll (滚动)! Turning over and over will makethe fire go out. Put a blanket (毯子) around you to keepair away from the fire that may still be on you. A clever family is ready all the time. If there is a fire, don’t forgetto call 119 for help.
查看完整题目与答案
【单选题】Speaker A: _____________________________________ Speaker B: He ’ s a manager in the hote l.
A.
What ’ s your brother?
B.
What does your brother do?
C.
Both A and B
查看完整题目与答案
【多选题】食品污染的防范措施有（ ）。
A.
持车间的良好通风和适宜温度，顶棚呈圆弧形，尽量缩小温差，有效控制水滴和冷凝水的形成
B.
对灯具加装防护罩，将易脱落碎片的器具更换为耐腐蚀、易清洗的不锈钢器具
C.
加工设备上的润滑油选用食用级的，对有毒、有害的化学品严格管理
D.
包装物料存放库要保持干燥、 清洁、通风、防霉，内外包装分别存放，上有盖布，下有垫板，并设有防虫鼠设施
E.
食品的储存库保持卫生良好，不同产品、原料、成品分别存放，设有防鼠设施
查看完整题目与答案
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