如下图所示,长方形截面细长压杆,b/h=1/2,若将凸改为h后仍为细长杆,则临界力pcr是原来的()倍。
A.2
B.4
C.6
D.8
第1题
You cannot be ______ careful when you drive a car.
A.very
B.so
C.too
D.enough
第2题
You cannot be ______ careful when you drive a car.
A.very
B.so
C.too
D.enough
第3题
You cannot be ______ careful when you drive a car.
A.very
B.so
C.too
D.enough
第4题
You cannot be ______ careful when you drive a car.
A.very
B.so
C.too
D.enough
第5题
You cannot be ________ careful when you drive a car.
A.very
B.so
C.too
D.enough
第6题
You cannot be______ careful when driving a car on the superhighway.
A.very
B.too
C.so
D.enough
第7题
You cannot be ______ careful when you drive a car.
A.very
B.so
C.too
D.enough
第8题
You cannot be______ careful when you drive a car.
A.very
B.so
C.too
D.enough
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