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What is the mass of a stationary electron?
9.11 x 10^-31 kg
1.67 x 10^-27 kg
3.14 x 10^8 m/s
6.02 x 10^23
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What is the name of the Old World flycatchers of subfamily Saxicolinae, which resemble small thrushes?
Parrot
Sparrow
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Pigeon
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