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【单选题】
汽油机与柴油机的本质区别是（ ）A.
汽油机有压缩过程，柴油机没有
B.
汽油机不能增压，柴油机可以有增压
C.
汽油机燃烧做功需要有火花塞点火，柴油机靠压燃着火
D.
汽油机吸入新鲜空气，柴油机吸入柴油与空气混合气
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皮皮学刷刷变学霸
举一反三
【单选题】_____ of the controllable pitch propeller enables the blades to be moved to change the pitch angle
A.
An external mechanism
B.
An internal mechanism
C.
An interlock device
D.
A hunting gear system
【简答题】PS当中,钢笔路径闭合后转化为选区的快捷键是____。
【单选题】The alternating current generator supplying a load has a voltage drop resulted from the loadWhen the load has a lagging power factor this voltage drop （）.
A.
is small
B.
may be neglected
C.
is useful
D.
is considerable
【单选题】Which of the following best describes a controllable cost?
A.
A cost which can be easily forecast and is therefore readily controllable using budgetary control techniques
B.
A cost which can be specifically identified with a particular cost object
C.
A cost which is easily controlled because it is not affected by fluctuations in the level of activity
D.
A cost which can be influenced by its budget holder
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