Which of the following statements about the light-emitting diode is correct？
A: The long pin is positive and the short one is negative.
B: The long pin is negative and the short one is positive.
C: Independent of pin length
D: Unable to determine
A: The long pin is positive and the short one is negative.
B: The long pin is negative and the short one is positive.
C: Independent of pin length
D: Unable to determine
举一反三
- Which of the following statements is correct? A: Government should tax goods with either positive or negative externalities. B: Government should tax goods with negative externalities and subsidize goods with positive externalities. C: Government should subsidize goods with either positive or negative externalities. D: Government should tax goods with positive externalities and subsidize goods with negative externalities.
- One way to classify emotions is by whether they are （ ） A: complex or negative B: positive or negative C: positive or complex D: simple or complex E: simple or negative
- If there are two goods, and if one good has a negative price and the other has a positive price, then the slope of the budget line will be positive.
- Which of the following parts of a negative message allows one to delay a negative with the help of a neutral or positive statement A: Subject line B: Buffe C: Reason D: Alternative E: Ending
- Which one of the following statements about image is NOT correct?