在轻质瓷坯料中加入黑色的腐植酸钠可提高坯料的成型性能。
参考答案:对
For a long time we that going to university and getting a degree will ensure a financially stable future.[ ]
A. are told
B. have told
C. have been told
D. tell
诊断急性阑尾炎最重要的体征是
A.右下腹有肌紧张
B.右下腹有反跳痛
C.右下腹有明显固定压痛点
D.闭孔内肌试验阳性
E.结肠充气试验阳性