下列哪种是没有细胞结构的微生物( )
A:细菌
B:霉菌
C:病毒
D:酵母菌
cooked , was , tired , visited, washed , cleaned , in , goes , told , next
My mother____busy last weekend . She____my grandma on Saturday m orning . They ____noodle together____the evening , she ____the clothes . She often____to the park, but she____my bedroom last Su nday. In the a fternoon , she went shopping . After supper , she ____stories for me .She was very ____last weekend . So I will help my mother do housework ____ weekend.
如图,一次函数y=kx+b的图象经过A、B两点,与x轴交于点C,则此一次函数的解析式为____,△AOC的面积为____.
已知一个正三棱锥的三条侧棱两两垂直且相等,底面边长为2,则该三棱锥的外接球的表面积是( )