12 views
vlogize
Extracting a Specific Portion of a String in R: The Ultimate Guide
Login with Google Login with Discord
Hoang Giang Share
Janusz
办美国文凭加拿大文凭澳洲文凭英国文凭学位证毕业证成绩单
Veinas bọt EPE máy móc
Wendy Ye
![[Chemistry] Reaction of HBr with 2-methylpropene yields 2-bromo-2-methylpropane. What is the structu](http://i.ytimg.com/vi/nAlyDMqLqfc/mqdefault.jpg "[Chemistry] Reaction of HBr with 2-methylpropene yields 2-bromo-2-methylpropane. What is the structu")
![[Chemistry] Finish the retrosynthesis of the following: How can you prepare (E)-2-pentene from ethyn](http://i.ytimg.com/vi/3qxrKC2ALfA/mqdefault.jpg "[Chemistry] Finish the retrosynthesis of the following: How can you prepare (E)-2-pentene from ethyn")
