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【单选题】
LTE中采用CP(Cyclic Prefix)的主要目的是()A.
可以提高峰值速率
B.
可以抵抗多径带来的ISI和ICI
C.
可以减小系统
D.
可以降低PAR
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【单选题】Medium-speed engines have the following advantages except____.
A.
medium-speed engines use less oil than slow-speed engines.
B.
medium-speed engines of later type are capable of burning low quality heavy fuel oil.
C.
the engines have long stroke which improve engine efficiency.
D.
the engines are compact, thus providing more spaces for cargoes and passengers.
【单选题】Medium speed engines have the following advantages except _______.
A.
medium speed engines use less oil than slow speed engines.
B.
Medium speed engines of later type are capable of burning low quality heavy fuel oil.
C.
The engines have long strokes which improve engine efficiency
D.
The engines are compact. Thus providing more spaces for cargoes and passengers.
【单选题】Medium-speed engines have the following advantages except
A.
medium-speed engines use less oil than slow-speed engines
B.
medium-speed engines of later type are capable of burning low quality heavy fuel oil
C.
the engines have long strokes which improve engine efficiency
D.
the engines are compact， thus providing more spaces for cargoes and passengers
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