淋巴液在淋巴管内流动所承受的阻力属于()
A.肌肉收缩力
B.组织器官间的被动阻力
C.内脏器官的摩擦力
D.内脏器官和固定装置间的阻力
E.体液流动产生的流体阻力
参考答案:E
工业上从含硒的废料中提取硒的方法之一是用H2SO4和NaNO3处理废料,获得亚硒酸和少量硒酸,加入盐酸共热,硒酸被转化为亚硒酸,2HCl + H2SeO4 == H2SeO3 + Cl2↑ + H2O,再将SO2通入亚硒酸的溶液中,单质硒即析出。据此下列叙述正确的是[ ]
A.H2SeO4氧化性弱于Cl2
B.二氧化硫的还原性强于Se
C.亚硒酸的氧化性强于硫酸
D.析出1molSe需H2SeO3、SO2、H2O各1mol
Several months later, he found his deskmate very difficult _____. [ ]
A. to get along with
B. getting along with
C. to get along
D. to be gotten along with