海船船员考试
单选题The projection on a shaft designed to change circular motion into up and down or back and fore motion is called （）.A wheelB crankshaftC running gearD cam
题目
wheel
crankshaft
running gear
cam
相似问题和答案
第1题：
Evaluate this SQL statement: SELECT e.EMPLOYEE_ID,e.LAST_NAME,e.DEPARTMENT_ID, d.DEPARTMENT_NAME FROM EMP e, DEPARTMENT d WHERE e.DEPARTMENT_ID = d.DEPARTMENT_ID; In the statement, which capabilities of a SELECT statement are performed?（）
A. Selection, projection, join
B. Difference, projection, join
C. Selection, intersection, join
D. Intersection, projection, join
E. Difference, projection, product
第2题：
Which of the following statements represents an advantage of an electromagnetic clutch?
A.Large misalignments can be tolerated between the shaft and engine coupling
B.Slip is held to a minimum when reversing shaft rotation
C.Engine torsional vibrations to the driven shaft are eliminated
D.It aids in maintaining power factor
第3题：
[A] objection [B] projection [C] project [D] object
前面提到人们生活在各种利益中，该句的romantic interest可理解为“浪漫/爱情兴趣”，与此语意构成逻辑关系的只有object，表示(情感)对象，其他不合文意。\[A\] objection意为“反对”；\[B\] projection意为“投射；投掷”；\[C\] project意为“计划，方案；项目”。该句含义为：就连你爱慕的对象也会另有其他选择。
第4题：
A wobbling tail shaft is an indication of ______.
A.shallow water
B.an engine that is misfiring
C.a tight tail shaft gland
D.worn stern bearing or misalignment
一个摇晃的为轴显示了轴封以损坏。
第5题：
______is a rounded projection at the forward end of a ship which reduces water resistance，thus allowing an increase in speed when the ships is in ballast．
A.Bulbous bow
B.Ellipse bow
C.Cyclical projection
D.Gnomonic projection
球鼻首是在船舶最前部圆形突出的部分，它用于减少水阻力，因此增加速度当船舶压载时。
第6题：
A. Selection, projection, join
B. Difference, projection, join
C. Selection, intersection, join
D. Intersection, projection, join
E. Difference, projection, product
第7题：
What prevents water running along the shaft of a leaking centrifugal pump from entering the shaft bearing ________．
A.Shaft seal
B.Water flinger
C.Drain hole
D.Lantern ring
第8题：
A SELECT statement can be used to perform these three functions:1. Choose rows from a table.2. Choose columns from a table3. Bring together data that is stored in different tables by creating a link between them. Which set of keywords describes these capabilities? （）
A. difference, projection, join
B. selection, projection, join
C. selection, intersection, join
D. intersection, projection, join
E. difference, projection, product
第9题：
A chart projection depicting the poles and a small area on either side of a connecting meridian, that is sometimes used for star charts, is the ______.
A.azimuthal gnomonic projection
B.Lambert conformal projection
C.transverse Mercator projection
D.polyconic projection
海图投影描述极地和链接子午线的任意一边的小区域，有时用作星图是墨卡托投影。
第10题：
Main shaft
正确答案:主轴