气压梯度力
参考答案：
单位质量的空气在气压场中受到的作用力。
若（2x-3）0有意义，则x______．
—Would you like to the discussion this Saturday?
—Sorry, I have an important meeting to .
A．attend; join
B．join; attend
C．join; take part in
D．join in; attend
