三氧化二铋(Bi2O3)俗称铋黄,是制作防火纸的材料之一.三氧化二铋中铋元素的化合价是( )
A.+6
B.+3
C.+2
D.-2
答案:B
按要求进行句型转换。
1. You can see that is a pear.(改为否定疑问句)
_____________ _____________ see that is a pear?
2. I can give her my pencil. (改为同义句)
I can give my pencil _____________ _____________.
3. The boy behind the door is Tom. (对画线部分提问)
_____________ _____________ is Tom?
4. Li Lei is in Team Four. Lin Tao is in Team Four, too. (合为一句)
Li Lei and Lin Tao _____________ in _____________ same team.
5. Jack and Mike are American. (改为一般疑问句)
_____________ Jack and Mike _____________?
患者,男,50岁。幼年患麻疹后反复咳嗽,迁延不愈,常咳脓痰。近半月加重,咳大量脓性臭痰,每日量约120~150ml。伴高热、气促。
最可能的诊断为
A.肺脓肿
B.支气管扩张症
C.肺结核
D.肺炎球菌性肺炎