basically u shud ask ur dentist ...
klystron can act as both an amplifier and oscillator whereas a reflex klystron can act as only an oscillator. klystron needs a buncher cavity(sometimes multiple bunchers) and a catcher cavity whereas a reflex klystron needs only one cavity. klystron bunches electrons in forward direction, whereas the other bunches in the reverse direction using a reflector plate. klystron needs i/p signal (accelerating or deccelerating potential) whereas the other dont.
Whenever you feel it needs it !
Sometimes, it needs a verb; sometimes it needs a subject.
Gossip is trash and needs to quit. It hurts people.
yes,whenever and wherever
Whenever it gets stinky.
"My dog needs special canine medicine." "I have a cavity in my canine tooth."
sometimes that happens like if she rejects him for a flirt or something and sometimes he wants stuff and your not fulfilling gis wants or his needs are low or maybe just because he wants to do more than talking and sometimes it just randomly happens.
Whenever it needs it.
Santa uses magic to hide whenever he needs to.
dia blog
Poriferans needs organic substances and cnidarians needs of a gastrovascular cavity with openings.