不论铸件的结构如何,同一铸件的线收缩率在各个方向都相同。
参考答案:错
Just a few minutes every day, _______ you could have shining floors and furniture with this new cleaner.
A.but
B.and
C.or
D.so
边缘性骨髓炎最常见病因()
A.下磨牙根尖感染
B.上磨牙根尖感染
C.颌下间隙感染
D.智齿冠周炎
E.医源性