诊断多发性骨髓瘤，患者骨髓中骨髓瘤细胞应大于______。
参考答案：15%或10～15%
During the reconstruction of the city, many modern tall buildings went up ______ old shabby houses were torn down.
A．where
B．in what
C．in which
D．which
收费站称重系统由哪些主要设备构成？
