当工作压力大于981×104帕时,氧气管道法兰宜采用()垫片。
A.铜
B.石棉橡胶
C.平石棉板
参考答案:A
34.He took his washing machine just bought dozens of days previously for 1800 yuan in the Guo Mei Applicance in for repair it needed replacing rather than _______
A.having been told, being repaired
B.only to be told , being fixed
C.just to be told, being mended
D.having been told, to be fixed
公司把亏损归咎于最近的经济发展趋势上。