Miss Li           Mary’s MP4 when they were having an art class yesterday.

A．took place

B．took off

C．took part

D．took away

单层厂房结构吊装起重机选择应根据（），在起重机不能任意靠近结构物去吊装构件情况下应考虑回转半径。在起重机必须（）的情况应考虑最小杆长Lmin。