皮皮学，免费搜题
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搜题
【单选题】
Why can't people on earth be harmed by radiation?A.
Because men on the Earth are protected by the atmosphere.
B.
Because radiation only has short-term effects on men on the Earth.
C.
Because there is a great distance between the Earth and the radiation areas.
D.
Because the Van Allen Belts absorb all radiation.
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皮皮学刷刷变学霸
举一反三
【单选题】下列数据记录有误的是( )
A.
用分析天平称 0.2800g 碳酸钠固体
B.
用移液管移取重铬酸钾标准溶液 25.00mL
C.
用盐酸滴定氢氧化钠，消耗体积 25.00mL
D.
用量筒量取 25.00mL 去离子水