在浇注前必须预热凸模，以保证浇注质量。预热温度同浇注方式和浇注合金的用量无关。
参考答案：错
Though ________ to a higher position, she still didn't content herself. [ ]
A. promoting
B. being promoted
C. having promoted
D. promoted
以下哪件作品不是古希腊的雕像（）？
A.掷铁饼者
B.埃赫拉顿像
C.荷矛的人
