会造成制冷压缩机起停频繁的是:()。
A.制冷剂含水多
B.系统混入空气
C.低压继电器幅差太大
D.滑油分离器回油阀堵
参考答案:A
To our joy, the program teaching patients painting, dance, music and crafts is having _______ results through our consistent effort.
A.enjoyable
B.outstanding
C.reasonable
D.reliable
灰尘会引发插槽与板卡()的现象。
A.死机
B.接触不良
C.无法显示
D.系统不稳定