Rewrite the following letter in technical writing style.

请重新用技术性写作风格改写以下信件。

原始信件：

尊敬的销售团队，

我想要咨询您公司的产品质量和售后服务。我曾经购买过一些其他品牌的产品，发现它们经常出现质量问题，且售后服务非常不及时或者无法解决问题。我希望您能够提供一些关于您公司产品质量和售后服务的详细信息，以帮助我做出选择。

谢谢！

新版：

尊敬的销售团队，

本人致函贵处，欲就贵公司产品质量及售后服务进行咨询。鉴于本人曾购买过其他品牌的产品，观察发现其质量问题颇多，同时售后服务又未能及时或有效解决，因此本人希望贵公司能向我提供更为详实的相关信息，以资参考选购之用。

谨此致以感谢！

此致，

敬礼！

相关问题

You will need to rewrite or cast the expression.

In PostgreSQL, if you encounter the error "You will need to rewrite or cast the expression", it means that the database is unable to implicitly convert or cast the expression to the desired data type.

To resolve this issue, you have a few options:

1. Use explicit casting: If you know the desired data type for the expression, you can use explicit casting to convert it. For example:

   SELECT column_name::desired_data_type FROM table_name;

Replace `column_name` with the actual column name and `desired_data_type` with the appropriate data type, such as `integer`, `text`, etc.

2. Modify the expression: If the expression is not compatible with the desired data type, you might need to modify it. This could involve changing operators, functions, or performing additional calculations to achieve the desired result.

3. Use a different function or operator: If the current function or operator is causing the error, you can try using a different function or operator that is compatible with the desired data type.

It's important to review the specific error message and the context in which it occurs to determine the best course of action. Refer to the PostgreSQL documentation for more information on data type casting and available functions/operators.

Rewrite the MyStack class in Listing 11.10 to perform a deep copy of the list field.

Sure, here's the modified version of the MyStack class that performs a deep copy of the list field:

import java.util.ArrayList;

public class MyStack implements Cloneable {
    private ArrayList<Object> list = new ArrayList<>();

    public boolean isEmpty() {
        return list.isEmpty();
    }

    public int getSize() {
        return list.size();
    }

    public Object peek() {
        return list.get(getSize() - 1);
    }

    public Object pop() {
        Object o = list.get(getSize() - 1);
        list.remove(getSize() - 1);
        return o;
    }

    public void push(Object o) {
        list.add(o);
    }

    @Override
    public Object clone() {
        MyStack cloned = new MyStack();
        for (Object o : list) {
            cloned.push(o);
        }
        return cloned;
    }
}

In the clone() method, a new instance of MyStack is created and populated with a deep copy of the original list field. This ensures that any modifications made to the cloned object don't affect the original object.