【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.
【判断题】越野花纹的凹部浅而粗,在软路面上与地面附着性好,越野能力强。( )
【单选题】羚羊角的来源是 Saiga tatarica L.雄性的角。
【判断题】越野花纹的凹部浅而粗,在软路面上与地面附着性好,越野能力强。( )
【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