更多"A person who is waiting for the ret"的相关试题:
[单项选择]According to the last paragraph, consumers who believe that organic foods are better than conventionally grown foods are often ______.
A. careless
B. mistaken
C. thrifty
D. wealthy
[单项选择]According to the last paragragh, consumers who believe that organic foods axe better than conventionally grown foods are often ______.
A. careless
B. mistaken
C. thrifty
D. skeptical
[单项选择]People who fly with Bel Air ______.
A. know they will travel a lot
B. get what they want quickly and safely
C. know that everything will be just fight
D. always travel right across the world
[单项选择]Those who won't work should be made（）
A. worked
B. work
C. to work
D. to be working
[单项选择]Housewives who do not go out to work often feel that they are not working to their full ______.
A. possibility
B. strength
C. length
D. capacity
[单项选择]The Martian surface temperature is 100 degrees below zero at night, so that butter put outside will not _______.
A. thaw
B. dissolve
C. melt
D. fuse
[单项选择]Travelers by Bel Air know that they will ______.
A. see films that they have seen before
B. eat the food that they have never had before
C. have a good rest
D. be best served on the plane
[多选题]2BEl系列瓦斯泵气量减少的原因是（ ）。
A.填料密封泄漏
B.吸人侧泄漏
C.工作水过少，或工作水温度过高
D.皮带打滑，转速下降
[多选题]2BEl系列瓦斯泵轴承部位发热的原因是（ ）。
A.电机、减速机、泵安装不对中
B.轴承安装不当
C.润滑不良，油脂干涸或太多
D.轴承被锈蚀，滚道划伤
E.V型轴封圈与轴承内盖压得过紧
[多选题]2BEl系列瓦斯泵气量减少的处理方法是（ ）。
A.检查泵间隙是否太大，必要时车短泵体
B.拆开泵检查密封面密封材料的稳定性，如已失效，应重新密封
C.更换分配板、阀板
D.更换阀球
[多选题]2BEl系列瓦斯泵运转不正常的原因是（ ）。
A.底座与基础接触不良，地脚螺丝松动
B.机组整体振动或接管振动
C.叶轮与分配板磨擦
D.汽蚀或皮带松弛，运转声音异常
[判断题]2BEl系列瓦斯泵启动水位过高，易造成启动困难。
A.正确
B.错误
[判断题]2BEl系列瓦斯泵自动排水阀泄漏，易造成气量减少。
A.正确
B.错误
[单项选择]Who should participate
A. People who have time.
B. All of the people.
C. Only those who have access to a phone.
D. Those with special experience.
[多选题]造成2BEl系列瓦斯泵轴功率增大的原因可能是（ ）。
A.填料压得过紧
B.吸入侧吸人固体颗粒或结垢或淤积
C.叶轮被脏物卡住或泵内生锈
D.工作液超过规定量或排气压力过高
[多选题]2BEl系列瓦斯泵轴承部位发热的处理方法是（ ）。
A.重新对中
B.重新调整轴承位置
C.改善润滑条件
D.更换轴承
E.适当调整V型圈的位置，减轻压力
[多选题]下列属于2BEl系列瓦斯泵气量减少的原因是（ ）。
A.间隙不合适，泄漏量太大
B.内部泄漏
C.分配板、阀板的缺陷
D.自动排水阀泄漏
