It has a certain effect to tend degeneration fermentation pit mud but it has certain difficulty to improve it completely.
采用己酸菌、液体窖泥混合培养液进行退化窖泥的养护具有一定的效果，但要彻底改善退化窖泥有一定的难度。
The tensiometer can measure the suction of soil reliably, and its structure is simple. But it has certain difficulty in monitoring the sectional suction of the soil.
张力计结构简单，能可靠地测量土壤吸力，但是监测土壤的剖面吸力有一定的困难。
The heavy oil with a very deep depth has a certain flowing capacity, but it has big flow resistance through the wellbore, which causes the main difficulty of production.
深层稠油在油藏条件下具有一定的流动能力，但在井筒中的流动阻力却很大，造成生产上的困难。
No code breakdown diagnosis has the certain blindness, so it is a difficulty in engine service.
无故障码故障的诊断带有一定的盲目性，是发动机维修中的一个难点。
No code breakdown diagnosis has the certain blindness, so it is a difficulty in engine service.
无故障码故障的诊断带有一定的盲目性，是发动机维修中的一个难点。
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