【单选题】下列应税消费品中,适适用定额税率征收消费税的是()。
【单选题】The pressure difference before and after the lube oil filter indicates ______ the filter should be cleaned.
【单选题】下列几种运动作简谐振动的是
C.
小物体在半径很小的光滑凹球面底作短距离往返运动
D.
浮在水面上的均质长方体木块受扰动后作无阻尼上下浮动
【简答题】作简谐运动的小球,速度最大值为vm=3cm/s,振幅A=2cm,若从速度为正的最大值的某时刻开始计算时间,做简谐振动的小球速度最大值为3cm/s。振幅A=2cm。令速度具有最大值时刻为t=0求,1振动周期。2加速度的最大值。3写出振动表达式
【单选题】The two maps below show an island before and after the construction of tourist facilities.
A.
The maps present the plan of an island both before and after tourism development took place.
B.
The maps present the plan of an island at two different times.
C.
The pictures present the plan of an island both before and after tourism development took place.
【简答题】What literary movements dominated the periods immediately before and after the American Civil War? What factors mainly caused the shift? Please name two representative authors respectively.
【单选题】One study conducted by a psychologist(121)of interviewing workers before and after the installation of a robot. The robot was used to control a matching process of stamping and assembling metal parts....