Don't play a trick _______ him. He's my new classmate.[ ]
A. at
B. to
C. for
D. on
答案:D
正常人24小时排尿量为()
A.300~500ml
B.500~1000ml
C.1000~2000ml
D.2000~2500ml
E.多于2500ml
酸渣排放比重(含固量)过高或过低对设备(系统)会造成什么样的影响?