An improved current-controlled tristate switching power amplifier based on sample-hold strategy is proposed in this paper.

提出一种改进的基于采样-保持策略的电流三态调制开关功放。

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If a dealer I do not know in Cameroon sends me a monkey skull I did not order and do not want as a sample without proper permits, America will hold me responsible.

ECONOMIST: Letters

They buy and hold all, or a representative sample, of the same securities in the index to replicate its performance.

FORBES: Index Fund Returns Get Better with Age

For the rest of the sample the link between inequality and homicide does not hold.

ECONOMIST: Brains bring ever larger rewards