中文：

购买吊车需要开具正规的发票，以证明购买行为的发生以及相关的税收义务。在购买吊车时，一般由销售方或服务商提供发票，并按照相关规定进行开具。

首先，在购买吊车时，应当向销售方或服务商提供购买凭证，例如：合同、收据等。这些凭证中应当包含购买方信息（如名称、地址、电话等）、销售方或服务商信息（如名称、地址、电话等）、吊车型号、数量、单价、总价等信息。

然后，销售方或服务商应当根据购买凭证，按照相关规定开具发票。发票应当包含以下信息：购买方名称、地址、电话等信息；销售方或服务商名称、地址、电话等信息；吊车型号、数量、单价、总价等信息；以及相关税收税率和金额等。

最后，购买方应当核对发票信息是否与购买凭证一致，如有不符，应当及时与销售方或服务商沟通解决。

英文：

When purchasing a crane, a formal invoice must be issued to prove the occurrence of the purchase and the related tax obligations. At the time of purchasing a crane, the seller or service provider usually provides the invoice and issues it in accordance with relevant regulations.

Firstly, when purchasing a crane, the buyer should provide the seller or service provider with purchase documents such as contracts and receipts. These documents should contain information such as the buyer's information (name, address, phone number, etc.), the seller's or service provider's information (name, address, phone number, etc.), crane model, quantity, unit price, total price, etc.

Then, the seller or service provider should issue an invoice in accordance with the relevant regulations based on the purchase documents provided by the buyer. The invoice should contain the following information: buyer's name, address, phone number, etc.; seller's or service provider's name, address, phone number, etc.; crane model, quantity, unit price, total price, etc.; and relevant tax rates and amounts.

Finally, the buyer should check whether the information on the invoice is consistent with the purchase documents. If there is any discrepancy, they should communicate with the seller or service provider for timely resolution.