【单选题】如图所示,弹簧振子以 O 点为平衡位置作简谐振动,当它从 C 向 O 点运动的过程中,位移方向及其大小的变化是( )
【单选题】古代包装的三次历史飞跃,按照演变的时间顺序分别是
【单选题】男性,28岁,汽车司机,前胸撞于方向盘上,伤后约1小时。查体:意识清,脉搏130次/分,奇脉(+),血压12/10.7kPa,呼吸32次/分,颈静脉怒张,心浊音界扩大,心音弱,两肺呼吸音正常,诊断可能性最大是
【简答题】电动汽油泵的作用? 2.电动汽油泵的检测方法? 3.燃油压力调节器的作用?
【单选题】古代包装的三次历史飞跃,按照演变的时间顺序分别是
【单选题】培训根据企业员工的不同状况,选择不同的培训内容,采取不同的培训方式,这是培训的( )原则?
【简答题】Stamp-collecting, once exclusively the hobby of small boys and an all-consuming passion for the older enthusiast has now become the target of financial speculators. Stamps are both portable and negoti...
【单选题】A Eddie McKay, a once-forgotten pilot, is a subject of great interest to a group of history students in Canada. It all started when Graham Broad, a professor at the University of Western Ontario, foun...
B.
A footnote about McKay.