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Friendly and attentive waiters are a key ingredient in the running of a successful restaurant.

And now more and more robots are replacing humans by providing a reliable waitressing service in Chinese restaurants and hotels.

One such new restaurant in Jiangsu Province, China, is staffed by 15 droids that not only carry food to a diner's table, but help cook it too.

Meals on wheels: A new restaurant in Jiangsu Province, China, is staffed by 15 droids (pictured left and right) that not only carry food to a diner's table, but help cook it too

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The futuristic employees greet customers, deliver food and help with cooking in the kitchen, according to local media - and if they encounter a rude customer, there is no chance of them spitting in the food.

Some of the robots can manage polite conversation, as well as greeting customers with 40 different phrases.

Just like with humans, the energy-intensive job takes its toll on the robots, which are expected to offer between five and eight years' service. 

Each one costs around 50,000 Yen ($8,100 or £4,843) each.

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Droid delicacies: Another robot restaurant that has been serving food for over a year, where the droids have cooked dumplings (pictured) and noodles for guests, is in Harbin, Heilongjiang province

A real drive-thru: Robot waiters follow tracks painted on the floor to carry food to tables from the kitchen, where they collect dishes prepared by a robotic chef that are placed on a conveyor belt

Another robot restaurant that has been serving dumplings and noodles cooked by droids for over a year, was set up in Harbin, Heilongjiang province.

When a diner walks into this restaurant, an usher robot extends its mechanical arm to the side and says 'Earth person hello. Welcome to the Robot Restaurant.'

Robot waiters follow tracks painted on the floor to carry food to tables from the kitchen. 

They collect dishes prepared by a robotic chef that are placed on a conveyor belt. 

There is even a singing robot to serenade diners.

Mechanical master chef: Customers at the restaurant watch a robot prepare their food

Attention please: The Pengheng Space Capsules Hotel in Shenzhen, has robotic receptionists and droid doormen as well as mechanical waiters

Similar robots are also taking over smalll tasks in hotels.

The Pengheng Space Capsules Hotel in Shenzhen, has robotic receptionists and droid doormen as well as mechanical waiters.

Because the robots are not paid a salary, a stay at the hotel is cheap at the equivalent of £6.80 per night. 

You have to get past him first: Because the robots are not paid a salary, stay at the hotel (pictured) is cheap, at the equivalent of £6.80 ($11) per night. A robot doorman is pictured waiting outside the hotel

An increasing number of hotels and restaurants in China are now using robots to perform tasks