脂肪栓子的形成是含有________或________严重挫伤时________破裂所释放的脂滴进入破裂的血管而入血。
参考答案:脂肪的长骨骨折;脂肪组织;脂肪细胞
--- Didn’t your brother ________ go to school by bike?
--- Yes, he did. But he ________ walking to school now.
A.used to; used to
B.use to; used to
C.used to; is used to
D.use to; is used to
计算除数是小数的除法,必须把被除数和除数都转化成整数,才能计算.______.(判断对错)