钢管混凝土中，为什么混凝土的强度能提高？
参考答案：
因为在较高应力状态下，混凝土的泊松比大于钢材泊松比，这样钢管对其内的混凝土形成横向“套箍作用
DEU比较来自EFISCP，WXRR/T和FMC的ND范围，什麽情况下显示“MAP/WXRRANGEDISAGREE”.（）
A.EFISCP和WXRR/T范围不一致
B.EFISCP，WXRR/T和FMC范围不一致
C.WXRR/T和FMC范围不一致
D.EFISCP和FMC范围不一致
Which of the following is the most accurate definition of the velocity of money The velocity of money is the:（）
A. GDP of a country divided by its price level.
B. money supply of a country divided by its price level.
C. GDP of a country divided by its money supply.
