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【单选题】
一种塑料抗氧化剂C可通过下列反应合成： 下列有关叙述正确的是A.
物质A中所有碳原子有可能位于同一平面
B.
物质B不能发生取代反应
C.
用酸性KMnO 4 溶液鉴别抗氧化剂C中是否含有CH 3 (CH 2 ) 17 OH
D.
1mol抗氧剂C与NaOH溶液反应，最多可消耗2mol NaOH
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举一反三
【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
【多选题】用基本工具进行测量时,下列读数正确的是( )
A.
用50分度的游标卡尺测得某物体长度为20.13mm。
B.
最小分度值为1mm的刻度尺测某物体长度为20.1mm。
C.
最小分度值为0.02g的物理天平测得物体质量为63.24g。
D.
用精度为0.01mm的螺旋测微器测得某物体长度为20.12mm。
【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
【多选题】关于千分尺下列说法正确的有:( )
A.
千分尺又叫螺旋测微 仪，是比 游标卡尺 更精密。
B.
千分尺的分度值为0.01mm
C.
25~50mm的千分尺其量程为25mm
D.
25~50mm的千分尺其测量范围与市值范围是不一样的
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