【单选题】(2011年四川广安,30题)锰(Mn)和镍(Ni)都是金属,将镍丝插入硫酸锰溶 液中,无变化;将镍丝插入硫酸铜溶液中,镍丝上有铜析出。则Mn 、Ni 、Cu的金属活动 性由弱到强排列正确的是
【单选题】_____ he has tried his best, I don’t mind his not having finished the task on time
【单选题】()是细菌发酵饲料的主要场所,有“发酵罐”之称。
【单选题】证据必须同案件事实存在某种联系,并因此对证明案情具有实际意义是指的证据的( )。
【单选题】锰(Mn)、镍(Ni)都是金属,将镍丝插入硫酸锰溶液中,无变化;将镍丝插入硫酸铜溶液中,镍丝上有铜析出.则的金属活动性由弱到强排列正确的是( )
【判断题】证据的关联性指证据必须同案件事实存在的某种联系,并因此对证明案情具有实际意义。( )
【单选题】Not having finished his homework,_____ to watch TV.
【单选题】____, they were forbidden to leave the company. [ ]
A.
Not having finished their jobs
B.
Having not finished their jobs
C.
Not finishing their jobs
D.
Not finished their jobs
【单选题】锰和镍(Ni)都是金属元素,将镍丝插入MnSO 4 溶液中无变化,插入CuSO 4 溶液中,镍丝上有红色固体析出。Mn、Ni、Cu三种金属的活动性由强到弱的顺序是 [ ]