养分流 nutrient flow
A、the recommended daily intake of a nutrient.
B、the smallest amount of a nutrient that maintains a defined level of nutritional health.
C、an amount of a nutrient that ensures optimal nutritional status.
D、an amount of a nutrient that includes a "margin of safety."
A、the nutrient broth only.
B、the nutrient broth and the tetracycline broth only.
C、the nutrient broth, the ampicillin broth, and the tetracycline broth.
D、the ampicillin broth and the nutrient broth without antibiotics.
A、the nutrient broth without antibiotics only
B、the nutrient broth and the tetracycline broth
C、the nutrient broth and the ampicillin broth
D、the tetracycline broth and the ampicillin broth
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