Which of the following is NOT a type of Chinese submarine?

The designation "AH-64" refers to the Apache Longbow, which is a multi-role attack helicopter developed by Boeing. This is clearly unrelated to submarines, as it operates in the air rather than underwater.

In contrast, the other designations—SSN, SSBN, and SS—are all established types of submarines within the Chinese Navy, and more broadly in naval terminology.

• SSN stands for nuclear-powered attack submarines, which are designed to engage enemy ships and submarines.

• SSBN refers to ballistic missile submarines, which are equipped to carry and launch ballistic missiles.

• SS generally denotes a conventional attack submarine, which operates using diesel-electric power.

Thus, the identification of "AH-64" as not being a type of Chinese submarine is accurate, given its classification as an aircraft, distinctly separate from submarine warfare.