频率配置原则收、发信号必须使用()频率。
A.不同;
B.相同;
C.稳定
参考答案:A
It is said that sixty percent of all energy ________ in the world today is being lost as waste heat.
A.produced
B.producing
C.to produce
D.having produced
与慢性特发性血小板减少性紫癜不相符合的是( )
A.血小板相关补体阳性
B.血小板形成的巨核细胞显著增加
C.血小板40×109/L
D.血小板生存时间明显缩短
E.骨髓巨核细胞显著增加