A:v(H2)=0.1 mol•L﹣1•min﹣1
B:v(N2)=0.2 mol•L﹣1•min﹣1
C:v(NH3)=0.15 mol•L﹣1•min﹣1
D:v(H2)=0.3 mol•L﹣1•min﹣1
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A. Canada B. UK C. China D. USA
It is usually warm in my hometown in March, but it ______ be rather cold sometimes.