超声多普勒血流仪可测定血管内血液的（）
A、压力
B、流速
C、成分
D、流向
E、流量
参考答案：B, D, E
小题1:They like ______________(eat)different kind of food.
小题2:What day ___________(be)it last weekend?
小题3:She can _____________(speak) much English.
小题4:It’s cold outside. _______ _____(not open) the door, please.
小题5: Peter_____ ____(see) an interesting talk show on TV now.
连锁企业该如何进行采购流程的再造？
