The qualification of water conservancy project construction supervision unit is divided into () supervision and other majors.

Requirements of water conservancy project supervision units and their personnel at the test site.

According to the Measures for the Administration of the Qualification of Water Conservancy Project Construction Supervision Units (Order No.29 of the Ministry of Water Resources), the qualification of water conservancy project construction supervision units can be divided into four majors: water conservancy project construction supervision, soil and water conservation project construction supervision, electromechanical and metal structure equipment manufacturing supervision, and water conservancy project construction environmental protection supervision. Among them, the professional qualification grades of water conservancy project construction supervision and soil and water conservation project construction supervision are divided into three grades: Grade A, Grade B and Grade C; the professional qualification of electromechanical and metal structure equipment manufacturing supervision is divided into Grade A and Grade B; the professional qualification of environmental protection supervision of water conservancy project construction is not graded for the time being. Therefore, ABCD should be chosen in this question.