洗煤厂“四无”是(). ["A、无积煤","B、无积水","C、无积尘","D、无积油","E、无杂物"]
“不动声色”中的“不”字声调该读() ["A、去声","B、阴平","C、轻声","D、阳平"]
杯状细胞常见于()。 ["单层扁平上皮","单层柱状上皮","复层扁平上皮","单层立方上皮","变移上皮"]
“美丽”一词连读时“美”字的调值为() ["A、211","B、214","C、35","D、55"]
在重力脱水区形成的滤饼,进一步到挤压区继续脱水。挤压脱水可分两种方式?
许多应用场合,出于对环境保护的考虑,已不再允许对气动设备进行油雾润滑。你的解决方案是?