【单选题】What is the author's attitude towards working irregular hours?
【单选题】What is the attitude the author has toward eating meat? ______
【判断题】已知某离散时间系统的输入信号为【图片】,输出信号为【图片】,【图片】,该系统是线性时不变系统。
【判断题】定积分只与被积函数有关,与积分上下限以及积分变量的符号无关。
【单选题】What is the author's attitude toward America's policies on global warming?
【判断题】定积分只与积分变量的符号有关,与被积函数以及积分上下限无关。