—Didn't you see the sign "No parking!" on the right?
—Sorry, I didn't. But now I know parking ____________ here.
A: wasn't allowed
B:isn't allowed
C:won't allow
D:doesn't allo
向质量为m克的CaCO3和KHCO3的混合物中,加入质量分数为a%的稀盐酸n克,恰好完全反应后,得到二氧化碳的质量是w克.(已知:KHCO3+HCl═KCl+H2O+CO2↑)下列说法正确的是( )
如图,胶州湾大桥是一座斜拉式大桥,斜拉式大桥多采用三角形结构,使其不易变形,这种做法的依据是____ .