A:free from; not a
B:free of; not a
C:far from; no
D:far away; no
加入抗凝剂的血液离心后出现分层现象,正确的分层顺序(由上向下)是( )
27÷4=____……____ 35÷6=____……____
52÷7=____……____ 46÷5=____……____
29÷8=____……____ 61÷9=____……____