An ideal standard is a standard which includes no allowance for losses, waste and inefficiencies. It represents the level of performance which is attainable under perfect operating conditions （ ）理想标准是不包括损失，浪费和效率低下的标准。 它代表了在理想的操作条件下可以达到的性能水平。（ ） A. 对 B. 错