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【多选题】
4Cs 营销理论中的4C是指A.
瞄准消费者需求
B.
消费者所愿意支付的成本
C.
消费者的便利性
D.
与消费者沟通
E.
促销活动开展力度
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】We have seen how the mixture of air and fuel is delivered by the fuel system to the engine cylinder, _________ it is compressed, ignited, and burned.
A.
when
B.
where
C.
that
D.
which
【单选题】The selection of an oil depends （） on the operating conditions, the design of the engine and the type of fuel to be burned.
A.
to a great extent
B.
on a great extent
C.
on mainly
D.
on only
【单选题】The piston then travels up through the cylinder and ( ) the burned fuel charge.
A.
opens
B.
closes
C.
exhausts
D.
none of above
【简答题】As fuel is burned in the engine, about one-third of the heat energy in the fuel is converted into power.
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