△+○=25…l,△最小是( )
A.26
B.51
C.76
D.48
除数最小为:1+1=2,
25×2+1,
=50+1,
=51;
答:除数最小是2,这时被除数是51;
故选:B.
Once out of the earth’s gravity, the spaceman is ___ by the problem of weightlessness.
A.affected
B.effected
C.related
D.offered
管道喷涂油漆时,应根据管道安装的环境条件,接触腐蚀性介质的(),选择适用的油漆。
A.酸碱度
B.浓度
C.温度
D.种类