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选词填空 全面 片面 斜 陡 平 寻找 要想做成大事,不能一味等待机会,还要主动( )机会。 他只看到了眼前的困难,( )地认为不会有好结果,却没有想过是挑战也是机遇。 他这个人就爱( )说,你别当真。 你小心一点儿,这条路不( ),你好好走,别摔了。
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【单选题】A large, low-speed, main propulsion diesel engine uses sea water to directly cool the _____.
A.
cylinder heads
B.
exhaust valves
C.
scavenging air
D.
injectors
【单选题】The main function of tie rods in the construction of large, low speed diesel engines is to _____.
A.
stiffen the bedplate in way of the main bearings to increase the engines longitudinal strength
B.
accept most of the tensile loading that results from the firing forces developed during operation
C.
mount the engine frame. securely to the hull to prevent shaft coupling misalignment
D.
connect the crosshead solidly to the piston rod
【单选题】平屋顶内排水的雨水口处保温层减薄、坡度加大,其作用是( )。 I.排水顺畅;II.方便安装雨水口; III.室内采暖时,可融雪;IV.防止结冰
A.
Ⅰ、Ⅱ、Ⅲ
B.
Ⅱ、Ⅲ、Ⅳ
C.
Ⅰ、Ⅱ、Ⅳ
D.
Ⅰ、Ⅲ、Ⅳ
【单选题】One major disadvantage of a low-speed diesel as compared to a steam main-propulsion system is（）.
A.
the extra weight required for the diesel reduction gearing
B.
a minimum speed for the engines that limits the minimum speed of the vessel
C.
the higher fuel consumption per SHP
D.
the low efficiency of the system when a controllable pitch propeller is used
【单选题】A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a ________.
A.
low TBN value
B.
high alkaline reserve
C.
low flash point
D.
high pour point
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