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【单选题】
单元体的应力状态如图示,其主应力有何特点 ?A.
σ 1 =σ 2 >0 ， σ 3 =0
B.
σ 1 =0 ， σ 2 =σ 3 <0
C.
σ 1 >0, σ 2 =0, σ 3 <0 ，∣ σ 1 ∣=∣ σ 3 ∣
D.
σ 1 >0, σ 2 =0, σ 3 <0 ，∣ σ 1 ∣> ∣ σ 3 ∣
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举一反三
【单选题】What happened at the height of the recession in the United States?
A.
10% of American people could find jobs.
B.
More than 2 million jobs were available each month.
C.
Job future in the country looked not very bright.
D.
The recovery of economy took hold in America.
【单选题】What happened at the United Nations? How did the critics like the new play? Soon after an event【C1】______, newspapers are on the street giving the details.【C2】______anything happens in the world, repo...
A.
makes sense
B.
makes progress
C.
takes place
D.
takes part
【单选题】What happened at the dance last year?
A.
There were misunderstandings.
B.
There were no guidelines.
C.
There wasn't a dance last year.
【简答题】Who won the World Cup 1994 football ? What happened at the United Nations? Howdid the critics like the new play? ___41___ an takes place, newspapers arc on the streets ___42___the details. W...
【单选题】Who won the World Cup 2004 football game? What happened at the United Nations? How did the critics like the new play?【61】an event takes place, newspapers are on the street【62】the details wherever anyt...
A.
Just when
B.
While
C.
Soon after
D.
Before
【单选题】What happened at the first Continental Congress?
A.
There was a heated debate
B.
A decision was made that all colonies should fight against the British
C.
The colonies declared independence
D.
The colonies declared war against Britain
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