如何仅选择一个下拉列表并禁用与单选按钮有关的所有其他下拉列表

$(function() {
  $('[name="course_name"]').on('change', function() { // whenever user changes his selection fire an event

    $select = $('[name="course_date"]');  // select element
    $select.attr('disabled', true);  // make all select disabled(if previously one of them wasn't)
    $(this).parent().siblings('[name="course_date"]').attr('disabled', false); // make the closest one active -- here I've first chose parent({label}) and then its sibling({[name="course_date"]})
  });
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<ul class='table_course_list'>

  <li class="inside_course_list">
    <!-- For Checkbox -->
    <label class="checkboxContainer" for="course_1">
    <input type="radio" id="course_1" name=course_name value="00011"><span class='checkmark'>course_1 </span>
    </label>
    <!-- Make the select disabled by default, so the user has to select radio button first -->
    <select id="course_date" class="box" name="course_date" disabled>
      <!-- <option selected>Choose ....</option> -->
      <option selected=selected disabled>PLease select objects</option>
      <option value="1">Jan. 7, 2020 - Aug. 6, 2020</option>

      <option value="2">May 13, 2020 - May 16, 2020</option>

      <option value="3">June 1, 2020 - June 13, 2020</option>

    </select>
  </li>

  <li class="inside_course_list">
    <!-- For Checkbox -->
    <label class="checkboxContainer" for="course_2">
    <input type="radio" id="course_2" name=course_name value="000022"><span class='checkmark'>course_2 </span>
    </label>
    <!-- Make the select disabled by default, so the user has to select radio button first -->
    <select id="course_date" class="box" name="course_date" disabled>
      <!-- <option selected>Choose ....</option> -->
      <option selected=selected disabled>PLease select objects</option>
      <option value="4">July 1, 2020 - July 15, 2020</option>

      <option value="5">July 17, 2020 - July 31, 2020</option>

      <option value="6">July 26, 2020 - Sept. 11, 2020</option>

    </select>
  </li>

</ul>