钢结构的极限状态分为( )极限状态和( )极限状态。
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When the world turns its ____ on you, and you turn your …...
A. hand
B. feet
C. back
D. bench
Many animals are ______ to noise.
A. sensitive
B. allergic
C. positive
D. negative
I used _____ photography to try and get clear photos.
A. fleet
B. flush
C. flesh
D. flash
not _____ you can change the past
A. use
B. useless
C. unless
D. less