搜题请搜索小程序“爱下问搜题”
问题 选择题

____.I can help you with your Chinese.    [ ]

A. Look out    

B. Don't worry    

C. Be careful    

D. No hurry

答案

答案：B

选择题

Many environmentalists think that carbon dioxide is _______ for the global warming, which affects billions and billions of species across the globe.[ ]

A. blamed  

B. to be blamed  

C. to blame 

D. blaming

查看答案
选择题

现已知：2H2（g）+O2（g）=2H2O（l），⊿H=－572kJ/mol；H—H键的键能为436kJ/mol；O="O" 键的键能为498kJ/mol，则H2O分子中O—H键的键能为

A．485.5 kJ/mol

B．610 kJ/mol

C．917 kJ/mol

D．1220 kJ/mol
查看答案