(A)越稀 (B)越稠 (C)稀稠不定粘度無(wú)關(guān)
(A)堵塞 (B)外管滲漏 (C)內(nèi)管滲漏
(A)116~138 (B)60~90 (C)138攝氏度以上 (D)200~250