71. Percentage of silica in a good brick earth lies between
72. The percentage of alumina in a good brick earth lies between
73. Asbestos . . . . . . . .
74. Asbestos . . . . . . . .
75. Asbestos cement . . . . . . . .
76. Asbestos is
77. The standard size of masonry bricks, is
78. The stone suitable for rubble masonry should be.
79. The filler used in plastic bitumen, is
80. Softer variety of steel may be obtained by
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