我们的重吊杆已经长时间不用了。()
A、Our derrick has been out of use for a long time.
B、Our heavy derrick has been out of use for a long time.
C、Our crane has been out of use for a long time.
D、Our winch has been out of use for a long time.
A、Our derrick has been out of use for a long time.
B、Our heavy derrick has been out of use for a long time.
C、Our crane has been out of use for a long time.
D、Our winch has been out of use for a long time.
A、促进钙和磷的重吸收 B、促进钙的重吸收和阻断磷的重吸收 C、促进钙的重吸收和阻断磷的重吸收,促进维生素D3的25位羟化 D、促进钙和磷的重吸收,促进维生素D的1位羟化 E、促进钙的重吸收和阻断磷的重吸收,促进维生素D3的1位羟化
A、周边(有压)给原煤、给介质的重介质旋流器 B、周边(有压)给原煤的重介质旋流器 C、中心(无压)给原煤、周边(有压)给介质的重介质旋流器 D、周边(有压)给介质的重介质旋流器 E、中心有压给原煤给介质的重介质旋流器 F、周边(无压)给介质的重介质旋流器