若呼吸停止时应采取的步骤是（）。 A.将病人头后仰、托起下颌、捏鼻、口对口人工呼吸

单词拼写。

1. He was always __________ (谦虚的) about his role in the expedition.

2. In Africa, many people die of _____________(饥饿) every year.

3. The boy__________(配备)himself with a sharp pencil and a rubber for the mid-term exam.

4. _________(数据)show that far more people are able to ride a bicycle than can drive a car.

5. India _________(出口) tea and cotton to many countries every year.

6. Have you take this into ________________(考虑)?

7. In recently years, the number of students is ___________ (扩大)rapidly in most university

8. __________(不幸地), he didn't pass the exam again.

9. What are some of the problems caused by _______ (化学) fertilizers?

10. He grew more and more popular and became known ________________(遍及)

下列自身抗体特性的描述，错误的是( )

A．自身抗体是自身免疫性疾病的重要标志
B．病人血液中存在高效价自身抗体是免疫病特点之一
C．某些自身抗体可以辅助疾病判断但无特异性
D．有些自身抗体与疾病活动性有关

填料是填料塔的核心，为使填料塔发挥良好的效能，填料应符合的要求有（）。

A．要有较大的比表面积

B．要有较高的孔隙率

C．要有良好的化学稳定性

D．要有较高的黏聚力

使用熔断器时应注意什么问题？

下列选项中，（）会造成电解式微量水分析仪不能升温或温升超过40℃的故障。

A、可控硅损坏

B、温控线路故障

C、接点温度计损坏

D、电解池插头脱落