确保餐厅的前面总是无脏污的。
Ensure that the front of the restaurant is spotless at all times.
弯管流量计以其无附加压损、可测脏污介质、结构简单、成本低廉等特点逐渐引起人们的重视。
The elbow flowmeter has some characteristics, such as without additional pressure loss, operational suitability for measuring dirty fluids, simple structure, low cast etc.
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