一个数,既是45的因数,又是45的倍数,这个数是______.
由分析得:一个数既是45的因数,又是45的倍数,这个数是45,
故答案为:45.
_____ make noise; they're _____ music. [ ]
A. Don't; listening to
B. Not; listening to
C. Don't; listen to
D. Not; listen to
苏木横断面所见的类圆形同心环纹是( )
A.异型维管束B.纤维素环C.年轮D.副形成层E.同心性异型复合维管束