A、A、≥2.5%/≥3.5%
B、B、≥2.5%/≥2.5%
C、C、≥3.5%/≥3.5%
D、D、≥3.5%/≥2.5%
答案:A
A、A、≥2.5%/≥3.5%
B、B、≥2.5%/≥2.5%
C、C、≥3.5%/≥3.5%
D、D、≥3.5%/≥2.5%
答案:A
A. A、6min
B. B、5min
C. C、3min
D. D、1min
A. A、变好
B. B、变差
C. C、不变
A. A、50%
B. B、60%
C. C、70%
D. D、90%
A. A、高炉气
B. B、煤气
C. C、精炼燃气
D. D、天然气
A. A、等熵,等压
B. B、等温,等压
C. C、等熵,等温
D. D、膨胀,压缩