For what reason are Category II and Category III furnaces rare?

A) The temperature of the system makes it hard to repair.
B) These furnaces are not reliable and require more maintenance.
C) These furnaces are no longer manufactured.
D) The venting system is made of a material that is no longer available.


D

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are _____. a. lanthanated b. pure c. irradiated d. thoriated

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What will be an ideal response?

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A. grade B. slope C. fill D. cut

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