问题
选择题
______ Lily and Lucy want to download music? [ ]
A. Do
B. Does
C. Are
D. Is
答案
答案：A
搜题请搜索小程序“爱下问搜题”
______ Lily and Lucy want to download music? [ ]
A. Do
B. Does
C. Are
D. Is
答案：A
NH3（g）+HBr（g）；2HBr（g）
Br2（g）+H2（g）．2min后，测得c（H2）=0.5mol/L，c（HBr）=4mol/L，若上述反应速率用v（NH3）表示，下列反应速率正确的是（ ）