【判断题】根据物流的定义,自高山上向下流动的泉水应视为物流活动。
【简答题】为提高自然采光和通风效果,并考虑到建筑的经济性,厂房的宽度不能太大。一般情况下,单层原料药厂房的宽度不宜超过 m,多层则不宜超过 m。
【简答题】二极管是用一个PN结制成的半导体器件,它的最基本性质是 ,硅管的死区电压和正向压降比锗管 的 ,而反向饱和电流比锗管的 得多。
【单选题】What's the author's attitude towards the Asian flu? ______.
A.
He simply reports the disease objectively
B.
He is worried about the spread of the disease
C.
He is disappointed at the tests of the London doctors
D.
He believes that the disease will soon be controlled
【单选题】为提高自然采光和通风效果,并考虑到建筑的经济性,厂房的宽度( )。