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【单选题】
( )是交流接触器发热的主要部件。A.
线圈
B.
铁心
C.
触头
D.
灭弧罩
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【单选题】Bob is very______, you never know what he is thinking.
A.
conservative
B.
reserved
C.
dead
D.
resent
【单选题】Your vessel has a gasoline engine and a mechanical exhaust ventilation system．BEFORE starting the engine，the exhaust blower should be run long enough to ______．
A.
warm up the exhaust blower motor
B.
provide a proper supply of fresh air for the engine（s）
C.
see the system is in good operating condition
D.
insure at least one complete change of air in the compartments concerned
【单选题】What does the man offer to do?
A.
Give the woman directions
B.
Send the woman a brochure
C.
Reserve a seat for the woman
D.
Waive the woman's registration fee
【单选题】What point does the author intend to put across in the first paragraph?
A.
Teaching and research are two contradictory fields.
B.
Research can never be overemphasized.
C.
The relationship between research and teaching should not be simplified.
D.
It is not right to overestimate the importance of teaching.
【单选题】If you were inspecting the valve springs on an auxiliary diesel engine, your best indication of impending spring failure would be ________.
A.
a glazed surface on the spring
B.
nicks in the protective coating
C.
a build up of sludge deposits
D.
cracks in the surface of the spring
【简答题】任务型阅读。 A. The engine in your body. B. The location, size and heartbeat of a heart. C. What happens when the heart beats? D. How does your heart work? E. How do we know about the heart? F. What can a d...
【单选题】电火花加工中精规准用于精加工,与粗规准相比,精规准多采用( )的电流峰值、( )频率和( )的脉冲宽度。 A 小,高,短 B 大,高,短 C 小,低,长 D 大,低,长
A.
B.
C.
D.
D
【单选题】Your vessel has a midships engine room and the cargo is concentrated in the end holds．The vessel is ______．
A.
sagging with tensile stress on main deck
B.
sagging with compressive stress on main deck
C.
hogging with tensile stress on main deck
D.
hogging with compressive stress on main deck
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