例句與造句

1. All these models employed output transformers and beam tetrode or pentode tubes ( for increased efficiency ).
2. The series shares the EIA 9BF pinout with a number of other miniature pentode tubes of the era.
3. Pentode tubes used in this circuit have a negative transconductance of only around-250 microsiemens, giving a negative resistance of-4000?.
4. The solid-state device which operates most like the pentode tube is the junction field-effect transistor ( JFET ), although vacuum tubes typically operate at over a hundred volts, unlike most semiconductors in most applications.
5. However, the dual-diode / triode and dual-diode / pentode tubes commonly used in these circuits had bulk wholesale costs that were as much as twice the cost of the tubes commonly used as plate detectors.
6. It's difficult to find pentode tube in a sentence. 用pentode tube造句挺難的