81. To stagger vertical joints in successive courses of a wall, a piece of brick is generally used at the end of the course, which is known as
82. The line of intersection of the surfaces of a sloping roof forming an external angle exceeding 180°, is
83. The angle between skew back of a flat arch and the horizontal, is kept approximately equal to
84. Stability of an existing structure may be disturbed by
85. The depth of excavation of foundations, is generally measured with a
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