Discussion
The cover of Goliath Edison screw type lamp holder is made of ______.
Answer: A
The Goliath Edison screw lamp holder is a large screw-type holder used for lamps of high wattage, where the heat of the lamp would damage an ordinary plastic. Its cover is therefore made of porcelain, which withstands high temperature and is a good insulator, and it is a material that does not burn. Bakelite, PVC and rubber soften or burn at the temperatures near a high-power lamp. The answer is porcelain, option (A).
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