【简答题】周期连续时间信号的频谱是离散频率的非周期函数( ),非周期连续时间信号的频谱是连续频率的非周期函数( )。
【判断题】无论连续还是离散时间信号,周期信号的频谱均为离散谱,非周期信号的频谱均为连续谱。
【单选题】During sea trial, the minimum constant running speed trial for the low speed main engine should be less than____minutes.
【单选题】银行承兑汇票的出票人于汇票到期未能足额交存票款时,承兑银行除凭票向持票人无条件付款外,对出票人尚未支付的汇票金额每天按照一定的比例计收利息,这个比例是( )
【单选题】__________ the lawyer’s opinion, the case should not go to trial.
【多选题】如果学习目标为掌握某种应用技能或特殊技能,则( )等方法应列为首选。
【单选题】英国人类学家( )认为宗教是对超自然和超人间的权威力量讨好并祈求和解的一种手段。
【单选题】The professional translation of the expression “randomized clinical trial”should be
【单选题】Though he is a murderer, he should receive a fair _____. [ ]
【单选题】During the trial, instructions to the jury should be made by: