用显微镜观察植物细胞时,视野中出现一个圆形且周边呈黑色、中央

用显微镜观察植物细胞时,视野中出现一个圆形且周边呈黑色、中央透明的物像,这一物像是(  

      A.细胞                   B.灰尘                    C.细胞核                D.气泡

答案

D

相关题目

如图7,正方形ABCD的对角线相交于点O,∠CAB的平分线分别交BD
如图7,正方形ABCD的对角线相交于点O,∠CAB的平分线分别交BD、BC于E、F,作BH⊥AF于点H,分别交AC、CD于点G、P,连结GE、GF. (1)求证:△OAE ≌△OBG.
八、书面表达 今年,H1N1流感肆虐全球,就如何预防H1N1流感
八、书面表达 今年,H1N1流感肆虐全球,就如何预防H1N1流感和保持健康,根据下列提示,完成一篇60-80字的英语作文。 要点提示:1、保持良好的饮食习
Long ago, people lived on wild animals, fruits and other plants and they didn
Long ago, people lived on wild animals, fruits and other plants and they didn’t need to use money. As time passed, families had more products(产品) than they needed, such as animals and crops. S
7.(山东)补写出下列句子中的空缺部分。(6分)   ⑴《论语》记
7.(山东)补写出下列句子中的空缺部分。(6分)   ⑴《论语》记载的孔子言论中,用星辰作比喻,形象的表述“为政以德”社会效果的句子是“       
 People wrote letters to get in touch in the past. Nowadays email has ______th
 People wrote letters to get in touch in the past. Nowadays email has ______the way people communicate. A. directed    B. conveyed    C. transformed    D. sponsored
We got _____ in the crowd. A.separated      B.divided         
We got _____ in the crowd. A.separated      B.divided              C.aparted             D.disappeared
右图是“法国明信片上列强在瓜分中国”漫画图。请问列强
右图是“法国明信片上列强在瓜分中国”漫画图。请问列强争相 在中国划分“势力范围”,掀起瓜分中国的狂潮的情形出现在 A.《南京条约》之后  
Sam________some knowledge of the computer just by watching others working on it
Sam________some knowledge of the computer just by watching others working on it. A.brought up  B.looked up C.picked up   D.set up

最新题目