关于滤线栅栅比叙述错误的是()
A.是栅条高度与栅条间距之比
B.是滤线栅的几何特性之一
C.越大消除散射线能力越强
D.也称曝光倍数
E.高电压时应用大栅比
参考答案:D
So absorbed in his work ____________that not a sound ___________.
A.was the president; did she dare to make
B.was the president; dared she to make
C.the president was; she dared make
D.the president was; she did dare to make
巴比妥类药物进入脑组织快慢主要取决于:
A.给药途径
B.药物剂型
C.用药剂量
D.药物脂溶性
E.药物分子大小