A light that has a light period shorter than its dark period is described as().
Bright field 与 Dark field 何者扫描速度较快?
Bright field 与 Dark field 何者灵敏度较好?
On my left()a wide river; on my right, a dark forest.
There is another thing I want to let you know. The lighting in the hold is very poor, even()dark to work the cargo.
On my left()a wide river; on my right, a dark forest.
Clear [1] and dark[ƚ]are allophones of the same one phoneme /1/.They never take the same position in sound combinations, thus they are said to be in c() distribution.
1 () into the dark, sure that I would finally reach the hospital.
They had the appearance of dark-skinned and dark-haired humans, _______ of course they were much smaller than ordinary people.
A dark exhaust from a running diesel engine can be caused by ()