【单选题】在碰撞理论中,碰撞直径d、碰撞参数b与反射角θ的理解,不正确的是( )
【简答题】已知函数f(x)=sin(x+ )+sin(x﹣ )+cosx+a(a∈R,a为常数). (Ⅰ)求函数f(x)的最小正周期; (Ⅱ)若函数f(x)在[﹣ , ]上的最大值与最小值之和为 ,求实数a的值.
【单选题】既能散肝经之寒邪,又可解肝气之郁滞,为治肝寒气滞诸痛的要药是
【单选题】在线零售时,易受店内广告影响的购物者行为类型是( )
【单选题】A) She received a bonus unexpectedly. B) She got a well-paying job in a bank. C She received her first monthly salary. D) She got a pay raise for her performance.
【单选题】•Read the magazine article below a new tape storage system. •For questions 23-28,choeso the correct answer. •Mark one letter (A, B or C) on your Answer Sheet. TapeStore: A NEW TAPE SIORAGE SYSTEM Tape...
A.
it can also take video cassettes.
C.
it holds more information.
【多选题】下列关于神经-骨骼肌接头处兴奋传递的描述,正确的是
D.
终板电位是局部电位,总和达到阈电位水平时,使终板膜产生动作电位