吸水率用重量吸水率表示。
参考答案:错
定义在R上的函数f(x)满足
①对任意x,y∈R有f(x+y)=f(x)+f(y)
②当x>0时,f(x)<0,f(1)=-2
(1)求f(0)值;
(2)判断函数f(x)奇偶性;
(3)判断函数f(x)的单调性;
(4)解不等式f(x2-2x)-f(x)≥-8.
—How many computers are there in the room?
—__________. Some workers moved them to another place just now.
A.None
B.Both
C.Nobody
D.Neither