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【简答题】
旅游活动的六要素是指食、住、行、游、_________、娱。
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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
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