A:组织培养
B:植物体细胞杂交
C:动物胚胎移植
D:单倍体育种
已知△ABC中,a=4,b=4,∠A=30°,则∠B等于( )
星星影院楼下有52排座位,每排有33个;楼上有42排座位,每排有39个。楼上、楼下大约分别能坐多少人?
提示单词:often, sometimes, always, never, once
Peter
Judy
Lucy
Lily
Sunday
√
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday