【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.
【判断题】犯罪空间周边治安监控情况是影响犯罪人选择犯罪空间的决定性因素。( )
【判断题】电解食盐水的总反应为:2NaCl(aq)+2H2O=Cl2(g)+H2(g)+2NaOH(aq)
【判断题】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2~4h应停止给水。
【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 。
【判断题】电解食盐水的总反应为:2NaCl(aq)+2H2O=Cl2(g)+H2(g)+2NaOH(aq)
【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