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half-value layer

gen. 半值房; 【核】半吸收层
chem. 半值厚度; 半值层 (HVL)
earth.sc. 半值〔价〕层; 半衰减 〔半吸收〕层
el. 半值层; 半衰减层
geophys. 半值【吸收】层
oil 半吸收层
half value layer
dermat. 半价层
el. 半值层【核】
wind. 半值层
half-value layer
: 1 phrase in 1 subject
Air defense1

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