主页
学科
搜索
账户
常见问题
当前学科：钻探工
题目：
单选题
密封轴承密封尚好，牙轮用手容易转动，则轴承磨损级别代号是（）。
A
Z4
B
Z3
C
Z1
D
Z2
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:
关于8类主要的性心理问题，下列说法中错误的是（）。
编制物资计划的步骤为（）
中国的商务谈判一般以两人为宜，一方面一个人在谈，一个人可记录或思考，另一方面两人可相互验证，使事情不那么复杂。()
联系是指事物、现象之间的相互影响、相互作用和相互制约。()
为什么在易燃易爆的场所不能穿化纤工作服？
甲公司自二级市场以22万元的价格购入B公司1%的股份，共10万股，B公司曾在5天前宣告分派现金股利，并将向股利宣告日后第7天的在册股东分派每股0.10元的现金股利。此外，甲公司还支付了股票的过户费等相关税费0.15万元。甲公司购入8公司股票后作为可供出售金融资产管理，则该项可供出售金融资产的初始入账金额为()万元。
确定施工进度控制的协调机制是施工进度控制的管理措施。
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! ___1___内应选（） ___2___内应选（） ___3___内应选（） ___4___内应选（） ___5___内应选（） ___6___内应选（） ___7___内应选（） ___8___内应选（） ___9___内应选（） ___10___内应选（）
Labat反应的试剂组成是（）