生物地球化学循环分气相、液相和沉积三个基本类型，其中磷循环属于典型的______型。
参考答案：沉积
当检查变速器机油油位时，要在变速器热的时候才能检查，并且将车停在半直的路面上，让发动机保持怠速运转，油位应在“满”的标线上。
Out of the crowded bus ,who was dressed in a black suit and waved to a woman.
A．a tall man in his thirties stepped
B．stepped a tall man in his thirties
C．did a tall man in his thirties step
D．did a tall man step in his thirties
