【单选题】Excel2010中选定17~200行的方法最简便的是 。
A.
鼠标单击第17行的行号,然后拖动垂直滚动条至200行,按住Ctrl键鼠标左键单击200行的行号。
B.
鼠标单击第17行的行号,然后拖动垂直滚动条至200行,按住Shift键鼠标左键单击200行的行号。
C.
鼠标单击第17行的行号,然后按PageDown键至200行,按住Shit键鼠标左键单击200行的行号。
D.
鼠标单击第17行的行号,然后按下方向键至200行,按住Alt键鼠标左键单击200行的行号。
【单选题】The ____pump is usually used as the emergency bilge pump.
【单选题】The ______pump is usually used as the lubricating oil pump.
【单选题】The lube oil pump used in a diesel engine is a ().
【单选题】The ____pump is usually used as the bilge feed pump to an oily water separator.
【单选题】在弹性力学中建立平衡微分方程时,除了用到连续性假定外,还应满足( )假定。
【单选题】The purpose of the wearing rings used in a centrifugal pump is to ().
A.
prevent an internal explosion in the pump when it is overheated
B.
enable a visual inspection of the pump while it is running
C.
insure a proper alignment of the pump coupling to the driver
D.
accommodate for friction between the impeller and the easing