对焊接零件表面及焊缝每边的铁锈、毛刺、油污等,必须彻底清除干净的范围是()。A、10

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问题:

对焊接零件表面及焊缝每边的铁锈、毛刺、油污等,必须彻底清除干净的范围是()。

A、10-30mm

B、20-40mm

C、30-50mm

D、40-60mm

考点:电焊工考试中级电焊工考试中级电焊工考试题库
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Mr. Black comes from New York in America(美国). He teaches(教)English in No. 3 Middle School (中学). He likes his work(工作) very much. He often says Chinese people are very friendly(友好).

He has two daughters(女儿). They are Lily and Lucy. They are twins(双胞胎). They are in the same school. They study(汉语) Chinese very hard(努力). The teachers and students all(都) like(喜欢)them. They have a lot of Chinese friends. 

阅读短文,判断正(T)误(F)。

小题1:Mr. Black is from New York .

小题2:Mr. Black teaches(教)English in No. 5 Middle School.

小题3:Lily and Lucy are twins.

小题4:Lily and Lucy are in different schools.

小题5:Lily and Lucy have a lot of Chinese friends.

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通常所说的“白色污染”是指:

A.白色建筑废料

B.石灰窑的白色粉尘

C.聚乙烯等塑料废弃物

D.冶炼厂的白色烟灰

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请标出下列各图中小磁针磁极或螺线管电源“+”“﹣”极和电流方向

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属于糖异生的酶是

A.丙酮酸脱氢酶
B.苹果酸脱氢酶
C.NADH脱氢酶
D.葡萄糖-6-磷酸酶
E.6-磷酸葡萄糖脱氢酶

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男性,28岁,因江水泛滥,饮用江水,突然出现剧烈腹泻,随后呕吐,由水样物转为"米泔水"样物,最可能的诊断是()

A.金葡菌胃肠炎

B.急性细菌性痢疾

C.大肠杆菌性肠炎

D.病毒性肠炎

E.霍乱

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