Triplane
A triplane is an aeronautical term that refers to an airplane with three similar-sized wings or pairs of wings. These wings are stacked one above the other to provide increased lift and maneuverability. Triplanes were popular during World War I for their agility and climb rate.
an aeroplane with two pairs of wings is called a biplane
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Forces ALWAYS come in pairs - as in "action/reaction". The atmosphere is no exception. For example, if the air pushes an airplane up, then the airplane also pushes the air down.
The term "bonding pairs" usually refers to electrons, so they would be negatively charged.
Cartesian product is the name that refers to the set of the ordered pairs. The Cartesian product of two sets A and B is AB.
Kerning
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Several possibly. Large quantities of shoes should be in your checked luggage and not carried on board. The overhead bins do not have enough room if everybody boarding had 5 pairs of shoes in their carry on luggage.
In xenon dichloride (XeCl2), the electron pair refers to the lone pairs of electrons on the xenon atom. XeCl2 has a total of 4 electron pairs around the xenon: 2 bonding pairs (from the bonds with the two chlorine atoms) and 3 lone pairs. These lone pairs result in a T-shaped molecular geometry due to the repulsion between the electron pairs, according to VSEPR theory.
An airplane with a single pair of wings is called a "monoplane." This is opposed to a "biplane" which has two pairs of wings or a "triplane" which has three. Since biplanes and triplanes have become so rare, the phrase "monoplane" has fallen into disuse as the monoplane configuration is regarded as being the standard.
The hidden question refers to Thursday's sales. "Half as many as what?"