30. It can be inferred from the passage that the sediment sieve has an advantage over the hand test in determining soil texture because
(A) using the sieve takes less time
(B) the sieve can measure clay
(C) less training is required to use the sieve
(D) the sieve allows for a more exact measure

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統計： A(0), B(2), C(1), D(1), E(0) #802203