眼睑的组织学构成包括______
A.皮肤
B.皮下组织
C.肌层
D.睑板
E.睑结膜
参考答案:A,B,C,D,E
After ________________ a sandstorm warning on Sunday evening, meteorologists forecast that dusty weather will continue in parts of the country on Monday.
A.breaking off
B.calling off
C.leaving off
D.putting off
萃取操作处理的对象是(),其分离的理论依据为利用()。