含沙量的单位为()。
A.kg/m3
B.mm
C.kg
D.kg/s
参考答案:A
I can't tell you the exact time I'll get there, maybe at eight or nine or even later. ____,
I'll be there as early as I can. [ ]
A. Anyhow
B. However
C. Thus
D. Therefore
大麦的平衡三级三体由两对非同源染色体构成,其中一对同源染色体载有绿色基因(γ),另一对同源染色体载有雄性不育基因(ms)。额外染色体为易位染色体,载有MS 和R 基因,R 基因使植株表现红色,MS 与R 距离很近,很难发生交换。该平衡三级三体自交,后代中有约____% 雄性可育的平衡三级三体,呈____色植株,____%是雄性不育的,为____色植株。