观察下列算式:21=2,22=4,23=8,24=16,25=32,26=64,27=128,28=256,…利用你所发现的规律,写出230的末位数(个位上的数字):( )
4
Those who brig sunshine into the lives of others cannot keep from themselves.
A.it
B.one
C.those
D.them
烧结多孔砖的抗压强度试验步骤同烧结普通砖,其加荷速度以( )为宜。
A.2~4kN/s
B.2~5kN/s
C.2~6kN/s
D.3~6kN/s