The cracking of glue to the timely replacement of watchband.
对于开裂开胶的表带要及时更换。 。
Advantages: probe to ensure normal work, if a fault can be timely replacement.
优点：可确保探头工作正常，万一发生故障亦可及时更换。
Should be the timely replacement of worn and out of the plunger valve coupled parts.
应及时更换已磨损的柱塞及出油阀偶件。
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