A:女儿色盲,父亲一定色盲
B:父亲不是色盲,儿子一定不是色盲
C:母亲不是色盲,儿子和女儿一定不是色盲
D:祖父的色盲基因有可能传递给他的孙女
Last year the teacher told us that the Earth ____ (go) around the Sun.
家庭电路中可利用电能表测量用电器的实际功率.小刚家的电能表如图所示,当电路中单独接入电热水壶时,测得电能表的转盘在360s内转过了81转(Revs),则此电热水壶消耗的电能是____J,此电热水壶的实际功率是____W.
—Philip is the first place winner in the writing competition.—_________ pleasant surprise this gave his teacher!
生物的一个细胞分成两个细胞的过程叫做____.
下列说法中,正确的是()