metaphase
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Equatorial Region
a. prophase b. metaphase c. anaphase d. telphase e. interphase
In aligned system you place the dimensions( or numerals) above the dimension lines so that they can be read from bottom or right edge of your sheet. In unidirectional system, all the numerals are placed along the dimension lines, all in the same direction such that they can be read from the bottom edge. This figure explains it clearly: http://www.maelabs.ucsd.edu/mae_guides/cad/dimensioning/Dimensioning_Fundementals_files/image034.gif
Rotate the pipe 180 degrees along a horizontal axis. Or look at the pipe from the other side. An angle that was not reflex will become reflex and conversely.
It can be an adverb: "He ran along beside me." It can also be a preposition: "Somewhere along the way I lost my hat. " It depends on the usage, and the definition can be nuanced. It is an adverb in the sentence "I went along with him" and a preposition in the sentence "The chairs are along the fence."