单词	十亿分率
释义	十亿分率parts per billion (ppb)
随便看	gas flame cutting machine gas flare gas flash tube gas flow gas-flow gas flow bending stress gas flow closing gas flow counter gas-flow counter gas-flow--counter gas flow counter -- flow counter gas flow counter ; flow counter gas-flow counter tube gas flow counter， flow counter gas flow detector gas-flow detector gas flow distribution gas flow impedance detector gas flow indicator gas-flow ionization chamber gas flow measurement gas flow meter gas flowmeter gas-flow neutron fluence rate measuring assembly gas flow recorder