YDS MODALS / TEST 1 43. Soru

Bu Testin Birincisi Sertavul

100 %

43.

-Using lasers to produce extremely short and
repeatable pulses of light, today scientists .......
events happening in time intervals as short as
l.000 trillionth of a second.

must have measured

were measuring

used to measure

may have measured

are able to measure

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