皮皮学，免费搜题
登录
搜题
【多选题】
青霉素钠具有下列哪些性质A.
遇碱β-内酰胺环破裂
B.
有严重的过敏反应
C.
在酸性介质中稳定
D.
6位上具有α-氨基苄基侧链
E.
对革兰氏阳性菌和革兰氏阴性菌都有效
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】阅读理解。 We think with our head. But can computers think? Does a computer have a head? We can use a computer to calculate, play s, send emails, do homework and other things. A computer has several pa...
【单选题】建立最广泛的统一战线是由近代 中国半殖民地半封建社会的阶级状况所决定的 ,其 阶级状况 的特点是( )。
A.
两头小中间大
B.
两头 大 中间 小
C.
我强敌弱
D.
势均力敌
【单选题】When we want to (56) other people what we think, we can do it not only with the help of words, but also in many (57) ways. For example, we sometimes move our heads (58) when we want to say 'yes', and ...
A.
say
B.
speak
C.
tell
D.
talk
【单选题】We think we can promise that the building will be ready()the end of August .
A.
by
B.
for
C.
to
D.
towards
【单选题】— What can we learn from Lei Feng? — We should not only think about , we should think about others as well.
A.
yourself
B.
ourselves
C.
themselves
D.
yourselves
相关题目：
参考解析：
知识点：
题目纠错 0
发布
