空气制动阀在“空气位”操作时，运转位因（）的位置同于“中立位”，故此时的功能与“中立位”相同。
参考答案：作用柱塞
Is it _____ Li Na, a Chinese famous tennis player, has achieved at the French Open _____ you are
happy so much?[ ]
A. what; that
B. that; what
C. that; it
D. it; that
She has bought herself ______ dress
A．a cotton purple expensive
B．an expensive purple cotton
C．a purple expensive cotton
D．a cotton expensive purple
