【单选题】The oil in a cargo winch gear box should be sampled periodically to _____.
A.
prevent the gear box from leaking
B.
prevent the oil from becoming inflammable
C.
make sure it has not become contaminated
D.
make sure the motor bearings are lubricated
【单选题】一个文件的相对路径名是从( )开始,逐步沿着各级子目录追溯,最后到指定文件的整个通路上所有子目录名组成的一个字符串。
【单选题】一个文件的相对路径名是从( )开始,逐步沿着各级子目录追溯,最后到指定文件的整个通路上所有子目录名组成的一个字符串。
【单选题】The riding pawl is ______.
A.
a safety interlock in a cargo winch that prevents the runner from overspeeding
B.
a stopper that prevents the anchor cable from running free if the cable jumps the wildcat
C.
the device that locks the deck lashings of the Peck and Hale system
D.
the lug that rides on the eccentric rib and engages the locking ring on the windlass
【单选题】一个文件的相对路径名是从( )开始,逐步沿着各级子目录追溯,最后到指定文件的整个通路上所有子目录名组成的一个字符串。
【单选题】( )是记录,体现设计构思意图,使构思形象化的一种重要手段
【简答题】设有一个 SPJ 数据库,包括 S , P , J , SPJ 四个关系模式:
【单选题】In the cargo winch, spur reduction gearing transfers the motor drive to _____.
【单选题】图像分辨率是用来衡量图像清晰度的一个概念,其表示图像中单位长度中包含的像素数。图像分辨率的单位是( ) 。