establishing rapport?
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No, "Mr" does not require a period after it. It is considered an abbreviation, and in formal writing, the period is typically omitted.
Period
Relationships between different organisms for an extended period of time is normally referred to as ecosystem. Ecosystems ensure that life is balanced and species continue surviving.
Amount which is reveived in advance from customer for goods but goods are not actually sold to that customer until some future period.
Formal assessments are not taken daily but are usually conducted over a period of time after teaching a subjects or topic to students/ group of students. As such they have to be summative
A taller building will swing back and forth more slowly (or for a longer period) than a shorter one.
Fundemental Period of building moving forward and backward
The fundamental building period is simply the inverse of the building frequency at the lowest harmonic - easy right? Basically, every system has a set of frequencies in which it "wants" to vibrate when set in motion by some sort of disturbance (in building design, typically a seismic or wind event) based on the system's mass and stiffness characteristics. The shortest frequency is known as the natural frequency. The inverse of frequency is the period of the system, and more specifically, the inverse of the natural frequency is the fundamental period.
I will request to the customer to give his/her personal detail so i can fulfill his/her requirements within a certain period
say what?
In my African American History book it says "The relationships between black people and Indians during colonial times were complex".