体力活动不受限。一般体力活动不引起疲劳、心悸、呼吸困难或心绞痛属于心功能() ["Ⅰ级","Ⅱ级","Ⅲ级","Ⅳ级","Ⅴ级"]
环氧乙烷泄漏检查采用下列何种方法()。 ["看有否泄漏气体","嗅是否有臭味","用10%溴麝香草酚蓝的饱和硫代硫酸钠液浸湿滤纸贴于可疑漏气处","用10%酚酞的饱和硫代硫酸钠液浸湿滤纸贴于可疑漏气处","用10%溴酚蓝的饱和硫代硫酸钠液浸湿滤纸贴于可疑漏气处"]
沥青老化的过程是沥青组分发生递变,其变化的规律为() ["树脂→油分→地沥青质","油分→树脂→地沥青质","地沥青质→油分→树脂","油分→地沥青质→树脂"]
“火星人来了”活动的参与人数在()最佳。 ["10-20","20-30","30-50","40-60"]
制备糖衣片时用于包衣的片芯形状应为() ["A.平顶形","B.扁形","C.浅弧形","D.深弧形","E.无要求"]
天然气有哪些优点?