完成碳钢电极(研究电极)表面石蜡涂抹步骤。
参考答案:
留下1cm3面积,用石蜡涂抹剩余面积,备用。注意:石腊的加热到刚溶化,这样金属的表面封的好。否则太薄或太厚都不好。
You can only use the dictionaries here. But they _______ out of the reading room. [ ]
A. can take
B. can't take
C. can be taken
D. can't be taken
与结核分枝杆菌抗酸性有关的成分是()。
A.蜡质D
B.荚膜
C.分枝菌酸
D.索状因子
E.磷脂