指出划线部分语法现象。(1)FPGAs are often used to provide a hardware platform on which to verify the physical implementation of new algorithms.(2)High-performance FPGAs containing millions of gates have become available.(3)ASIC has a disadvantage that the final design is frozen in silicon.(4)Both are custom-designed to address specific applications, the only difference being that an ASIC is for use by a specific company, while an ASSP is marketed to multiple customers.(5)Depending on the way in which they are implemented, some FPGAs may only be programmed a single time.