测量氧气压力时,严禁压力表内有(),否则有爆炸危险。 ["水","油脂","空气","杂质"]
对全口义齿的固位和支持有利的粘膜形态是() ["厚、松软","厚、韧","薄","薄、干燥","B和D"]
下列哪种人可进入高原地区() ["患有器质性疾病者","年龄大于60岁者","重度神经衰弱","呼吸道感染者","轻度高血压者"]
蜡样管型主要见于() ["慢性肾小球肾炎晚期","长期无尿、少尿","尿毒症","急性肾小球肾炎","肾病综合征"]
简述战略性贸易政策
车辆技术档案的格式由()制定。