皮皮学，免费搜题
登录
搜题
【单选题】
酮替芬在H1受体拮抗剂中属发哪一结构类型 ( )A.
氨基醚类
B.
哌嗪类
C.
哌啶类
D.
胺类
E.
三环类
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
【单选题】抗H 1 R 阻断药多数有中枢神经抑制作用,是因为( )
A.
通过血脑屏障拮抗组胺介导的觉醒反应
B.
麻醉中枢的兴奋性神经元
C.
增强中枢GABA能神经元的功能
D.
扩张脑血管，改善脑循环
E.
以上都不是
【简答题】图示为由机械A、B、C组成的机械系统,它们的效率分别为 ,输出功率分别为 。 (1)试问该机械系统是属于串联、并联还是混联系统? (2)写出该系统应输入总功率N的计算式。
【简答题】读一读，填一填。 Mike and Lily are going to the bookstore (书店). In the bookstore, Mike wants (想要) to buy (买) a pen. He says, ' I like this pen. How much is it? ' The salesman (售货员) answers, ' 3 yuan.' Lily li...
【单选题】图示为由机械A、B、C组成的机械系统,它们的效率分别为 ,输出功率分别为 。 (1)试问该机械系统是属于串联、并联还是混联系统? (2)写出该系统应输入总功率N的计算式。
A.
串联
B.
并联
C.
混联
D.
【简答题】阅读电子邮件，然后回答问题。 To: Lily@penpal . com From: Tom@penpal . com Dear Lily, I'm happy to have a new pen pal. I am English, but I live in Beijing now. I like playing football with my friends. I often play f...
【简答题】用括号内所给词的适当形式填空。 1.I________ ( go) to the library yesterday morning. 2. We had an________ (interest) holiday in America last year. 3. It started to rain when we________ (leave) the house. 4. Hong Kong ...
【简答题】- Lily , could you please pass me the______ ? I want to cut the apple . - Sure , here you are .( )A. pen B. pencil C. book D. knife
【简答题】用所给单词的正确形式填空。 1. Do they have any ____________ (toy)? 2. It is ____________ (Lily) pen. 3. There are a lot of ____________ (girl) students in our class. 4. ____________ (leaf) turn yellow in autumn. 5...
【单选题】—Lily, could you please pass me the______? I want to cut the apple. —Sure, here you are.
A.
pen
B.
pencil
C.
book
D.
knife
相关题目：
参考解析：
知识点：
题目纠错 0
发布
