48______
A.intr oduced
B.recognized
C.identified
D.considered
上一篇 (20分)(1)为了清理堵塞河道的冰凌,空军实施投弹爆破,飞机在河道上空高H处以速度v0水平匀速发
下一篇 42_______. A. happy B. lively C. reliable D. punctual
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