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Chris Fayers, head of environment at Hinkley Point C, said the testing had gone "really well"

return stack.length;

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国务院有关部门、有关地方人民政府、核设施营运单位应当依法制定核事故应急预案，开展应急演练，做好核事故应急相关工作。

const circle = new Circle({ radius: 1.5 });