The mineral oil is used in Dr. Li’sexperiment to _____
A: control the concentration of odours ina slightly detectable degree.
B: act as a group of comparison with thatof the other smells.
C: regulate the participants’ moods bydecreasing the smell’s concentration.
D: protect the participants from losingsense of smell.
A: control the concentration of odours ina slightly detectable degree.
B: act as a group of comparison with thatof the other smells.
C: regulate the participants’ moods bydecreasing the smell’s concentration.
D: protect the participants from losingsense of smell.
举一反三
- “Scent” vs. “Stench”: Both words mean “smell,” but Scent is often used to describe good smells (flowers, baked goods, etc.) while Stench connotes a negative smell.
- The participants of the meeting discussed, ______ , the future of the oil industry. A: from now on B: in the way C: among other things D: on their mind
- Why must researchers avoid generalizing from focus group participants to the whole market？（ ） A: Participants' responses are not reliable. B: Most of the participants are likely to be ignorant about the topic of discussion. C: The size of the group is too small and the sample is not drawn randomly. D: Most of the participants are likely to exhibit similar tastes and preferences. E: The participants usually come from diverse backgrounds.
- The flower _____. A: looks beautiful but doesn't smell good B: looks beautiful and smells well C: looks beautiful but not smells good D: not only look beautiful but also smell good
- Measuring a colored solution by using of Beer's law, when the concentration is c, the transmittance is T. If the concentration is changed to c/3 and other conditions remain unchanged, then T is ______ .when the concentration is 2c, T is ______