A.want their pigeons to win the race
B.are sending radar signals to their pigeons
C.do not know whether the race began on time
D.do not trust the rules set down by the judges
第8题
A.烟气流量增加,排气温度升高
B. 烟气流量减少,排气温度升高
C. 烟气流量增加,排气温度降低
D. 烟气流量减少,排气温度降低
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