Spinach is a kind of high volume fruits.

1. Which of the following is not a commonly used semiconductor material'? A) carbon B) lead C) silicon D) germanium 2.The characteristic of an ideal diode are those of a switch that can conduct current . A) in both directions B) in one direction only C) in both directions but in only one direction at a time D) depends on the circuit it is used in 3.When a diode is doped with either a pentavalent or a trivalent impurity its resistance will . A) increase B) decrease C) make the resistance stable against variation due to temperature D) None of the above 4.The piecewise linear model, equivalent circuit of the diode consists of ___. A) a junction capacitor, a battery, a small resistor, and the ideal diode B) a battery, a small resistor, and the ideal diode C) a battery and the ideal diode D) the ideal diode 5.When a p-n junction is reverse-biased, its junction resistance is ____. A) high B) low C) determined by the components that are external to the device D) constantly changing

A、online advertising

B、mobile advertising

C、guerrilla advertising

D、broadcast advertising

A、DIY store

B、bakery

C、convenience store

D、flea market

A、trolley

B、promotion

C、receipt

D、bakery

A、brand-oriented shopper

B、rational shopper

C、bargain shopper

D、indecisive shopper

A、regular

B、passing trade

C、prospect

D、patron