余热锅炉整体水压试验中,上水温度不得超过()℃,试验压力为()Mpa,在此压力下保持20分钟。
A.801.5
B.601.0
C.400.75
D.50,0.85
参考答案:C
如果公司的销售方式以分期收款为主,其应收账款周转率会表现出差异。()
In the city the old _____.[ ]
A. take good care of
B. are taken good care of
C. is taken good care of
D. are been taken good care of