问题
多项选择题
制冷系统的日常维修保养包括（）等工作。
A.保持机器的各摩擦部件有良好的润滑条件
B.保持机器运转部件的正常温度和正常声音
C.保持机器的清洁
D.使机器与设备恢复原来的精度和效率
答案
参考答案：A, B, C
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制冷系统的日常维修保养包括（）等工作。
A.保持机器的各摩擦部件有良好的润滑条件
B.保持机器运转部件的正常温度和正常声音
C.保持机器的清洁
D.使机器与设备恢复原来的精度和效率
参考答案：A, B, C
It was during those hard days in a small community． Food was in short supply． I used to stop by Mr．Miller's stand for One particular day, while Mr．Miller was some potatoes for me I noticed a small boy admiring a basket of green peas． Soon I was also to the fresh green peas． The boy left． Mrs．Miller _ to me and said, "There are two other such boys in our _, all from poor families． Jim always offers to our produce for their marbles（弹珠）． He somehow makes them believe he likes red marbles ．Sometimes he even sends them home with some peas for ．" I left the stand, with this man． Years later, I went back to visit some in that community and while I was there I learned Mr．Miller had died． I agreed to my friends to see Mrs．Miller． Upon our arrival, we offered whatever words of ． Ahead of us were three young men． They moved to the casket（棺椁）． Mrs．Miller's eyes followed them each young man placed his own hand over the cold pale hand and then left． Our turn came to meet Mrs．Miller．I told her who I was and mentioned the of the marbles． She said, "Those three young men were the boys． They told me how they Jim's kindness．" "We've never had much ," she said, "but right now, Jim would consider himself the man．" Then she lifted her husband's lifeless fingers． beneath the hand were three shining, red marbles !
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