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【单选题】
地球上的岩石可以分为火成岩、沉积岩、变质岩。由硅酸盐溶浆凝结而成的火成岩构成了地壳的主体，按体积和重量计算。但地面最常见到的则是沉积岩，它是早先形成的岩石破坏后，又经过物理或化学作用在地球表面的低凹部位沉积，经过压实、胶结再次硬化，形成具有层状结构特征的岩石。在地壳中，在大大高于地表的温度和压力作用下，岩石的结构、构造或化学成分发生变化，形成不同于火成岩和沉积岩的变质岩。 这段文字主要介绍了地球上各类岩石的( )。
A.
形成条件
B.
结构特征
C.
地质分布
D.
化学成分
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举一反三
【单选题】Bob is very______, you never know what he is thinking.
A.
conservative
B.
reserved
C.
dead
D.
resent
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【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
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【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
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【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.
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【单选题】What covers your engine?
A.
hod
B.
hode
C.
hodor
D.
hood
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【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
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【判断题】子类覆盖父类中的方法时,访问修饰符权限必须大于父类中的访问修饰符。
A.
正确
B.
错误
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【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...
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【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
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【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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相关题目：
【单选题】Bob is very______, you never know what he is thinking.
A.
conservative
B.
reserved
C.
dead
D.
resent
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案
【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.
查看完整题目与答案
【单选题】What covers your engine?
A.
hod
B.
hode
C.
hodor
D.
hood
查看完整题目与答案
【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
查看完整题目与答案
【判断题】子类覆盖父类中的方法时,访问修饰符权限必须大于父类中的访问修饰符。
A.
正确
B.
错误
查看完整题目与答案
【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...
查看完整题目与答案
【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
查看完整题目与答案
【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
查看完整题目与答案