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【单选题】
下列哪种情况,会出现零序分量?A.
过负荷
B.
三相短路
C.
两相接地
D.
两相短路
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反馈参考答案：
举一反三
【简答题】举例说明β－内酰胺抗生素的分类和代表药物
【简答题】菜豆最适宜在土层深厚、[填空(1)] 丰富、排水和通气性良好的壤土或沙壤土栽培，合适的土壤pH为[填空(2)] ，不耐[填空(3)] ，pH小于5.2容易发生重金属中毒而造成植株矮化，叶片[填空(4)] 。
【简答题】Section B Directions: Inthis section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once, After you h...
【单选题】Listen to the passage and choose the best answer to each question. Question 1 passage 3.mp3:
A.
It was designed by an English engineer.
B.
It was built in the late 19 th century.
C.
It was purchased by the Royal family.
D.
It was equipped with rubber tyres.
【简答题】16-19.mp3: Section B Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once....
【多选题】菜豆最适宜在土层深厚、 [填空(1)] 丰富、排水和通气性良好的壤土或沙壤土栽培，合适的土壤 pH 为 [填空(2)] ，不耐 [填空(3)] ， pH 小于 5.2 容易发生重金属中毒而造成植株矮化，叶片 [填空(4)] 。
A.
有机质
B.
6.0～7.0
C.
酸和盐碱
D.
失绿
【单选题】两名技师讨论如何安装车轮的问题,技师A说:为了达到最佳平衡,安装时应以对角的顺序拧紧螺栓。技师B说:应用润滑脂来润滑螺栓的螺纹部分,避免螺栓锈蚀。说法正确的是:( )
A.
技师A
B.
技师B
C.
两者都正确
D.
两者都不正确
【单选题】mp3: Choose the best answer.
A.
5 days a week.
B.
4 days a week.
C.
3 days a week.
D.
6 days a week.
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