按发生机理，土壤自净化可分为物理净化、化学净化和生物净化。其物理净化不包括( )。
A．挥发 B．淋洗C．扩散 D．凝聚
参考答案：D
--- Mike, what did our monitor say just now?
--- Every boy and every girl as well as the teachers who _____ to visit the museum _____ asked to be at the school gate before 6:30 in the morning.
A．is ; is
B．are; are
C． is; are
D．are; is
T管引流患者护理不正确的是（）
A.妥善固定
B.观察引流液的量和性质
C.通常留置3～5天拔管
D.必要时可用无菌盐水冲洗导管
E.拔管前需试行夹管1～2天
