金属化合物的焰色反应呈现的色彩丰富多样,灼烧钠盐时,火焰的颜色呈( )
A.蓝色
B.黄色
C.绿色
D.紫色
经实验证明,做金属化合物的焰色反应时:灼烧钠盐,火焰的颜色呈黄色.
故选B.
用括号中所给词的正确形式填空。
1. There are some _____ (tomato) in the basket.
2. Do you like French _____ (fry)?
3. She _____ (have) ice cream for dessert.
4. _____ (health) food is important.
5. She _____ (do not) play sports.
6. _____ your mother _____ (watch) TV every day?
7. The little girl likes _____ (strawberry) a lot.
8. Lots of children like _____ (play)football.
9. Chicken _____ (be) very delicious.
10. My daughter _____ (go) to school from Monday to Friday.
有关原发性肺脓肿,下列哪项不正确
A.常为吸入口咽分泌物携带的细菌感染所致
B.为多种化脓性细菌的混合感染
C.多数为厌氧菌属感染
D.急性病例可有杵状指或肥大性骨关节病