如图是电饭锅的电路图，S是温控开关，R₁、R₂是电阻丝。闭合和断开开关S，可选择电饭锅处于“加热”或“保温”状态。若R₁:R₂=1:35，电饭锅“加热”时的总功率为P₁，“保温”时的总功率为P₂，则P₁:P₂为

A．36:1

B．35:1

C．36:35

D．35:36

The permant dunnage attached to the frames of the ship that aids in ventilation is (are) the（）.

A.hatch boards

B.tank top

C.hatch beams

D.sweat bettens