高血压持续多年后后引起全身细小动脉硬化,病变最显著的是( )
A.肝细小动脉硬化B.脑细小动脉硬化C.肾细小动脉硬化D.脾细小动脉硬化E.肺细小动脉硬化
参考答案:C
He is, however, one of those restless people who never ___ content with their present environment.
A.have seemed
B.seemed
C.seems
D.seem
关于细菌质粒的描述中,不正确的是
A.指细菌染色体外的双股环状DNA
B.可在细菌问互相转移
C.带有某些决定细菌生物学性状的基因
D.细菌生命活动必需的遗传物质
E.可与宿主菌DNA整合