我国小儿传染病的计划免疫有
A.结核菌灭活菌液
B.麻疹减毒活疫苗
C.百日咳菌液、白喉类毒素、破伤风类毒素
D.脊髓灰质炎灭毒死疫苗
E.以上都是
参考答案:B,C
请用括号中所给词的正确形式填空。
1. Marvin, you were walking _______(slow). Please walk more _______(quick).
2. Susie, you were reading a letter _______ (serious). Please read it _______ (sad).
3. Mary, you were setting the table too _______ (noisy). Please do it _______ (quiet).
4. Mike, you were bringing in the food _______ (casual). Please do it _______ (formal).
5. Am I speaking too _______ (fast)?
6. The weather was _______ (terrible) bad.
为保证设备和系统的密闭性,在验收新设备时,在设备修理之后及在使用过程中,必须用( )检查其密闭性,测定其是否漏气并进行气体分析。
A.气压试验 B.水压试验C.动力试验 D.气密试验