A.Only one black actor has ever been nominated fro the Academy Awards.
B.Only three black actors have ever won the best director title.
C.The black actors are given a separate award.
D.The black actors experience more unfair treatment.
第1题
卧式锅壳式锅炉锅筒上的排污阀公称通径不得小于()。
A.65mm
B.40mm
C.20mm
D.50mm
第3题
卧式锅壳上排污阀的公称通径不得小于()。
A.30mm
B.40mm
C.50mm
D.60mm
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