全世界规定辐射剂量标准（）。
A: 低于10千/Grade
B: 低于12千/Grade
C: 低于15千/Grade
D: 低于20千/Grade
A: 低于10千/Grade
B: 低于12千/Grade
C: 低于15千/Grade
D: 低于20千/Grade
A
举一反三
内容
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辐照食品的辐照剂量要低于()Grade。 A: 15千 B: 5千 C: 10千 D: 20千
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辐照食品的辐照剂量要低于()Grade。 A: 15千 B: 5千 C: 10千 D: 20千
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辐照食品的辐照剂量要低于()Grade。 A: 15千 B: 5千 C: 10千 D: 20千
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辐照食品的辐照剂量要低于()Grade。 A: 15千 B: 5千 C: 10千 D: 20千
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The most common division between primary and secondary education in the US is ___________.（ ） A: primary schools (Grade 1 to Grade 6) and middle schools (Grade 7 to Grade 12) B: elementary schools (Grade Kindergarten to Grade 8) and high schools (Grade 9 to Grade 12) C: elementary schools (Grade Kindergarten to Grade 3), middle schools (Grade 4 to Grade 6) and high schools (Grade 7 to Grade 12) D: grammar schools (Grade Kindergarten to Grade 6) and high schools (Grade 7 to Grade 12)