汽车起重机按重量分为轻型、中型、重型三种，下列规格的起重机中，属于中型起重机的是( )。
A．12t
B．16t
C．40t
D．50t
参考答案：C
—Where did you have the discussion with Professor Snow?
—It was in the classroom ________ we had a biology lesson yesterday.
A．which
B．when
C．that
D．where
沟通中要掌握和了解患儿的身心特点有哪些？
