Q346
Samples of dust collected to a depth not exceeding . . . . . . . . millimeters on the roof and sides and to a depth not exceeding . . . . . . . . millimeters on floor.
A.
20, 25
B.
20, 15
C.
10, 5
D.
5, 10
AnswerAnswer: Option D
Solution
Answer: Option D
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