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【单选题】
在 Word 2010 中,如果要输入符号“☆”,应单击( ) 。A.
“开始”选项卡中的“字体”对话框中的“符号”按钮
B.
“插入”选项卡中的“符号”对话框中的“符号”按钮
C.
“开始”选项卡中的“段落”对话框中的“符号”按钮
D.
“开始”选项卡中的“符号”对话框中的“符号”按钮
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举一反三
【单选题】Rotating shafts particularly those that run at high speeds, must be designed to avoid operation at speeds.
A.
. low
B.
.overload
C.
critical
D.
hollow
【单选题】The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of_____.
A.
an isochronous governor
B.
elastic engine mounts
C.
a vibration damper
D.
a cast iron bed plate with good flexible qualities
【单选题】Engine speeds at which resonance can occur are termed ______.
A.
maximum speeds
B.
sea speeds
C.
full speeds
D.
critical speeds
【单选题】Engine speeds at which resonance can occur are termed ____.
A.
maximum speeds
B.
full speeds
C.
sea speeds
D.
critical speeds(临界转速)
【单选题】Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an __________.
A.
engine support vibration isolator
B.
detuner or viscous fluid damper
C.
lightened crankshaft flywheel
D.
spherically seated crankshaft bearing
【单选题】Engine speeds at which resonance can occur are termed _____.注:resonance 共振
A.
maximum speeds
B.
full speeds
C.
sea speeds
D.
critical speeds
【单选题】Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an _____.
A.
spherically seated crankshaft bearing
B.
engine support vibration isolator
C.
detuner or viscous fluid damper
D.
lightened crankshaft flywheel
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