【单选题】测量液体压力时,取压点应在管道下部,使导压管内不积存气体,测量气体时,取压点应在管道上( )方,使导压管内不积存液体
【简答题】已知信号 如图( a )所示,求其频谱函数 F ( jw )
【单选题】下列各设备中,全部属于计算机输出设备的一组是( )。
【单选题】听力原文:You know Sara. If She has an opinion, everyone has got to know it. Which of the following statements is true about Sara?
A.
She rarely makes mistakes.
B.
She makes known what she thinks.
C.
She has many original ideas.
D.
She doesn't like to express her opinions.
【单选题】下列处方中常见的外文缩写,其含义是“每隔一日用药”的是