The Encyclopedia Americana, Volume 7Grolier, 1985 - Encyclopedias and dictionaries |
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Page 71
The tree climates are differentiated from one another by the mean temperature of the coldest month . ( The mean temperature is the average of all the daily temperatures . ) If the coldest month has a temperature higher than 64 ° F ( 18 ...
The tree climates are differentiated from one another by the mean temperature of the coldest month . ( The mean temperature is the average of all the daily temperatures . ) If the coldest month has a temperature higher than 64 ° F ( 18 ...
Page 138
Where roof support is required ( as is often the case in weak shale ) , the overhead rock may be held in place by timber props , rock bolts , or other means . Artificial support is limited where possible to permanent openings .
Where roof support is required ( as is often the case in weak shale ) , the overhead rock may be held in place by timber props , rock bolts , or other means . Artificial support is limited where possible to permanent openings .
Page 484
Boolean algebra is an algebra of logic , in which the multiplication sign ( - ) means “ AND , ” the addition sign ( + ) means “ OR , ” and a bar over any symbol means “ NOT . ” An affirmative statement , such as A , can therefore be ...
Boolean algebra is an algebra of logic , in which the multiplication sign ( - ) means “ AND , ” the addition sign ( + ) means “ OR , ” and a bar over any symbol means “ NOT . ” An affirmative statement , such as A , can therefore be ...
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