“必须求出此电阻上的电压和电流。”一句的英文表达，哪一项正确？ A: It is necessary to find out the voltage and current of this resistor. B: It is necessary to find out the voltage and current on this resistor. C: It is necessary to find out the voltage and current for this resistor. D: It is necessary to find out the voltage across and current through this resistor.

It can be learned from the passage that______. A: the artificial noses are even better than the human noses B: it has not taken long for the artificial noses to be introduced to the market C: the attempts of the artificial noses to imitate the olfactory abilities have been largely unsuccessful D: the artificial noses have their own advantages over the human noses

Which of the following products are light industrial products? A: Textile B: Foodstuff C: Electrical appliances D: Chemicals

Pharmaceutical companies often develop drugs by first using automated methods to screen massive libraries of compounds to find chemicals that are able to inhibit the activity of an enzyme of interest.

Various strategies have been proposed to achieve these ___. A: chemicals B: objectives C: pollutants D: projections