人体进行呼吸作用最重要的意义是[ ]
A．产生二氧化碳
B．分解有机物
C．提供能量
D．吸收氧气
答案：C
____, her suggestion is of greater value than yours.
A．All things considering
B．All things considered
C．All things were considered
D．With all things were considered
安装变频器时，在电源与变压器之间，通常要接入（）和接触器，以便在发生故障时能迅速切断电源，同时便于安装修理。
A.断路器
B.熔断器
C.继电器
D.组合开关
