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【单选题】
能使图示简支梁中的应变能增大一倍的情况是( )。A.
载荷增大一倍
B.
跨度增大一倍
C.
弹性模量减小一半
D.
截面高度减小一半
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反馈参考答案：
举一反三
【单选题】_____ clearances in the main or crank pin bearings will sometimes be indicated by loss of pressure in the lubricating system before any bearing knock is heard.
A.
Too larger
B.
Too smaller
C.
Excess
D.
Excessive
【单选题】It usually (takes) much (less) time (to fly) from one country to another than (traveling) by train.
A.
takes
B.
less
C.
to fly
D.
traveling
【单选题】One of the disadvantages of traveling as an air courier is that he ______.
A.
cannot decide when and where to travel
B.
cannot take any luggage with him
C.
has to wear two pairs of jeans
D.
saves little money from the travel
【单选题】On a medium-speed main propulsion diesel engine, the crank-pin or crank journalbearings receive lubricating oil from( ).
A.
a spindle lubricator
B.
an oil jet
C.
internal splashing
D.
drilled passages in the crankshaft
【简答题】电动势的方向规定从电源的负极指向正极即____升高的方向。
【单选题】It usually takes much (less) time to fly from one country to (another) than (traveling) (by) train.
A.
less
B.
another
C.
traveling
D.
by
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