问题
单项选择题
具有迁徙扩散生长现象的细菌是（）
A.大肠埃希菌
B.奇异变形杆菌
C.鼠伤寒沙门菌
D.宋内志贺菌
E.肺炎克雷伯菌
答案
参考答案：B
解析：普通变形杆菌和奇异变形杆菌的大多数菌株在营养琼脂和血琼脂平板上呈迁徙扩散生长现象，即迅速形成波纹状薄膜而布满整个平板培养基表面。
搜题请搜索小程序“爱下问搜题”
具有迁徙扩散生长现象的细菌是（）
A.大肠埃希菌
B.奇异变形杆菌
C.鼠伤寒沙门菌
D.宋内志贺菌
E.肺炎克雷伯菌
参考答案：B
解析：普通变形杆菌和奇异变形杆菌的大多数菌株在营养琼脂和血琼脂平板上呈迁徙扩散生长现象，即迅速形成波纹状薄膜而布满整个平板培养基表面。
A lot of students are having all kinds of sports on the playground. A football game is going on right now ______ Class 3 and Class 4. We don’t know which team will ____. Look at those people over there! Some students of Class 1 are practicing the ____ jump. One of them is the best high jumper in the school. He practices hard every day. Many people think he will _____ the school record in the sports meeting next spring. Not far away from them, some girls are preparing for a race. They____ have a 600-meter race soon. Now on the corner of the field, you can see another group(群) of students. Their teacher is ____ them how to throw discus(铁饼). In schools, ____ students love sports now. Sports help people to keep ____. They also help people to live happily. And ____ doing sports on the field ,.people will ____ good friends with each other, too. Do you think so ?
|