通过接触了被传染源的分泌物和排泄物污染的手或玩具等日常生活用品而感染被称为
A.消化道传播B.接触传播C.体液传播D.飞沫传播E.以上均不是
参考答案:B
动词填空。
1. We should try our best _____ (help) others.
2. Why not _____ (go) the Great Wall with us?
3. The boy is crying. Can you make him _____ (laugh)?
4. I hope _____ (become) a famous singer.
5. He was late for school because of _____ (get) up late.
6. I _____ (not write) a letter to Peter once a week last year.
从事无损检测的人员,必须经资格考核,取得相应的资格证书,持证人员的资格证书有效期为( )。
A.2年
B.3年
C.4年
D.5年