在一定条件下，以能否由原发行的股份公司出价赎回为依据，优先股分为（）。
Ⅰ.不可赎回优先股
Ⅱ.可转换优先股
Ⅲ.可赎回优先股
Ⅳ.不可转换优先股
| It is hard to predict how science is
going to turn out, and if it is really good science it is impossible to predict.
If the things to be found are actually new, they are by definition unknown in
advance. You cannot make choices in this matter. You either have science or you
don’t, and if you have it you are obliged to accept the surprising and
disturbing pieces of information, along with the neat and promptly useful
hits, The only solid piece of scientific truth abut which I feel totally confident is that we are profoundly ignorant about nature. Indeed, I regard this as the major discovery of the past hundred years of biology. It is, in its way, an illuminating piece of news. It would have amazed the brightest minds of the 18th. century Enlightenment to A. man cannot solve all the problems he can think up because of the limits of human intelleot B. man can find solutions sooner or later to whatever questions concerning nature he can think up C. sooner or later man can think up all the questions concerning nature and answer them D. questions concerning consciousness are outside the scope of scientific research [简答题]有一功率P为400kW的负载，功率因数cosφ为0．8，试求该负载在t=0．25h内所消耗的电能A、视在功率S和无功功率Q各为多少？
[判断题]暖通工程制图中，一个图样只能选用一种比例。( )
[多选题]电源侧不停电更换电能表时，直接接入的电能表应将出线负荷断开，应有防止（ ）（ ）（ ）的措施。
A.相间短路 B.过电压 C.相对地短路 D.电弧灼伤 [单选题]高速道岔维护原则:应对钢轨件顶面轮廓和走行光带进行检查观测，光带应( )，尖轨和心轨的变截面处、焊接接头处光带应均匀过渡，并保证尖轨和心轨降低值的正确。《高速铁路工务知识读本》4.4.1
A.居中 B. 连续 C.均匀 D. 以上都是 [简答题]简述体育管理组织封闭与开放的矛盾。
[单选题]关于睾丸的描述正确的是( )。
A.男性生殖腺 B.位于阴囊内，左右各一 C.表面光滑，呈白色 D.重10～15g E.以上均对 [单项选择]在单缝夫琅禾费衍射实验中，屏上第三级明纹对应的缝间的波阵面，可划分为半波带数目为（）。
A. 5个 B. 6个 C. 7个 D. 8个 [单选题]遇调度所CTC设备不能正确显示列车占用状态时，列车调度员应立即通知车站转入（ ）模式。
A.非常站控 B.分散自律控制 [判断题]低层的水汽辐合,可以形成一条明显的湿舌,它实际上是在对流层下部的一条狭窄的暖湿空气带;强对流天气常先在湿舌的北侧爆发。
A.正确 B.错误 [单选题]接地线拆除后,( )不得再登杆工作或在设备上工作。
A.工作班成员 B.任何人 C.运行人员 D.作业人员 [判断题]维修时应将所有的控制手柄置于零位( )
A.正确 B.错误 [判断题]民主评议党员不可以结合组织生活会一并进行。
A.正确 B.错误 我来回答: 提交
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