【单选题】It can be inferred from the text that the author believes that _____.
A.
nationwide application of anti-pollution devices can finally prevent cancer.
B.
tough legislation is needed to set lower limits of worker exposure to harmful chemicals.
C.
more research is required into the causes of cancer before further progress can be made.
D.
industrialization must be slowed down to prevent further spread of cancer-causing agents.
【单选题】新生儿生后多长时间不排出胎粪者需检查排除肛门闭锁
【判断题】电解食盐水的总反应为:2NaCl(aq)+2H2O=Cl2(g)+H2(g)+2NaOH(aq)
【简答题】断食时间一般牛、羊宰前禁食 h ,猪 h ,家禽 h 。为了防止屠宰畜禽倒挂放血时胃内容物从食道流出污染胴体,宰前 h 应停止给水 。
【单选题】新生儿后多长时间不排胎粪者需检查排除肛门闭锁