《周礼》中的医师是
A.医学技术的权威人士
B.主管医药政令,负责医药事务的官员
C.是掌握专门技术的专科医生
D.主持医学教育的卫生行政官员
E.以上都不是
参考答案:B
—Why did Miss Wang look so worried when we saw her?
—Because she wondered ____.
A. where did the other students go
B. when would the policeman come
C. if her students had survived the earthquake
混合站压力降的大小,主要取决于孔板和蝶阀的阻力损失。一般按管道最大流量计算,孔板的压力降值为多少mmH2O?()
A.15~20
B.20~30
C.30~40
D.40~45