多级式离心式水泵按级数分叙述正确的是（）。_矿井泵工_全学科试题题库

当前学科：矿井泵工

题目：单选
多级式离心式水泵按级数分叙述正确的是（）。
答案： <查看本题扣1积分>

查看答案

答案不对？请尝试站内搜索

推荐知识点:

下列属于保荐机构从事保荐业务的记录是（　　）。

运行中的电流互感器若要更换检测仪表，必须将其二次绕组短接，然后再进行换接。

虚劳，心悸，自汗，神疲嗜卧，心胸憋闷疼痛，形寒肢冷，面色苍白，舌质淡，有齿印，脉弱。辨证属（）

公共选择是指政治市场上各参与者依据一定的规则共同确定（）的过程。

长期使用利尿药的降压机制是.

与相应抗原结合后，能与C1q结合活化补体的Ig是（）

如何检测玉米粉中掺有石灰石粉？

可能的诊断是（）

企业运行机制包括（）

As Christmas is coming, there are presents to be bought, cards to be sent, and rooms to be cleaned. Parents are ___1___ with difficult jobs of hiding presents from curious young children. If the gifts are large, this is sometimes a real ___2___. On Christmas Eve, young children find the excitement almost unbearable. They are torn between the wish to go to bed early so that Father Christmas will bring their presents quickly and the wish to stay up late so that they will not miss the fun. The wish for gifts usually proves stronger. But though children go to bed early, they often lie awake for a long time, hoping to get a short ___3___ at Father Christmas. Last Christmas, my wife and I successfully hid a few large presents in the storeroom. I ___4___ the moment when my son, Jimmy, would ask me where that new bike had come from, but ___5___ he did not see it. On Christmas Eve, it took the children hours to go to sleep. It must have been nearly ___6___ when my wife and I went quietly into their room and began filling stockings. Then I pushed in the ___7___ I bought for Jimmy and left it beside the Christmas tree. We knew we would not get much sleep that night, for the children were ___8___ to get up early. At about five o’clock the next morning, we were woken by loud sounds coming from the children’s room — they were shouting excitedly! Before I had time to get out of bed, young Jimmy came riding into the room on his new bike, and his sister, Mary, followed close behind pushing her new baby carriage. Even the baby arrived. He moved ___9___ the hands and knees into the room dragging a large balloon behind him. Suddenly it burst. That woke us up ___10___. The day had really begun with a band! ___5___内应选（）