The advantages of u sing heat carries for indirect heating were shown as early as using water,vapor, molten salt and liquid metal.

 
  • 利用載體間接加熱的優(yōu)越性,早在利用水、蒸汽、熔鹽和液態(tài)金屬的初期就已經(jīng)顯現出來(lái)了。
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