信号: signal; semaphore; gun无效: of no avail; to no avail; in ...标: Rockwell A scale信号无负载: signals with load信号无驱动: signals with drivers等信号无线电台: equisignal radio station; equisignal station等信号无线电信标: equisignal radio beacon钉样信号无夺获: spikes without capture信号无连接控制: signal connectionless control效标: criterion等信号无线电导航系统: equal signal system等信号无线电导航信标: equisignal radio beacon求救信号无线电波段: distress radio frequency无线电雾号无线电雾信号: radio fog signal无效呼叫信号: signal for ineffective call参数时必须说明硬盘的序号无效的硬盘分区表: cmbr效标法: criterion of internal consistency效标组: criterion group无效: of no avail; to no avail; invalid; null and void; nullity (合同等的); in vain; unavailability; ineffectiveness; inefficiency; futility; flop 宣布选举无效 nullify an election; 医治无效 fail to respond to medical treatment; 宣布决定无效 declare decision invalid; 无效的契约 an invalid contract; 无效投资 make the investment inefficient; 无效法律行为 nullity of juristic act; 无效分蘖 [农业] ineffective tillering; 无效功 lost work; 无效合同 invalid contract; 无效劳动 lost labour (in agricultural production); 无效期 adynamic stage; 无效诉讼 annulment suit; 无效条款 irritancy; 无效约因 infirmative consideration成效标准: performance standard成效标准法: performance standard method绩效标准: performance standards疗效标准: criterion of therapeutical effect失效标准: failure criteria实践效标法: empirical criterion