【多选题】要做到理论联系实际,在实际工作中必须反对( )倾向。
【单选题】由于凸轮与从动杆的运动不在同一平面内,因此是一种空间凸轮机构,可使从动杆得到较大的行程这种凸轮机构属于( )。
【单选题】Over the past l00 years,sea level steadily as a result of global warming.
【简答题】无阻尼单自由度体系的自由振动方程,其通解为$y(t) = {C_1}sin omega t + {C_2}cos omega t$,则质点的振幅为( )。
【简答题】As more and more people speak the global languages of English, Chinese, Spanish, and Arabic, other languages are rapidly disappearing. In fact, half of the 6,000-7,000 languages spoken around the worl...
【单选题】无阻尼单自由度体系的自由振动方程:y(t)=C1sinωt+C1cosωt。则质点的振幅ymax。 ( )