问题
单项选择题
在图示四种应力状态中，关于应力圆具有相同圆心位置和相同半径者，有下列答案：（）
A.(a)与(d)
B.(b)与(c)
C.(a)与(d)及(c)与(b)
D.(a)与(b)及(c)与(d)
答案
参考答案：C
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在图示四种应力状态中，关于应力圆具有相同圆心位置和相同半径者，有下列答案：（）
A.(a)与(d)
B.(b)与(c)
C.(a)与(d)及(c)与(b)
D.(a)与(b)及(c)与(d)
参考答案：C
What is the relationship between the foreign firm affiliates and local firms in the country
A．The foreign firm affiliates are developing as rapidly as other local firms.
B．The foreign firm affiliates are not developing as rapidly as other local firms.
C．The foreign firm affiliates in this country have significantly enhanced the technological upgrading of local firms.
D．The foreign firm affiliates in this country have hardly exerted any positive influence on the technological progress of local firms.