有关细菌毒素正确说法是（） A.只有G-菌产生内毒素 B.外毒素主要由G+菌产生，其

根据句子意思及首字母，写出正确的单词形式。

1. Nice to s________ you.

2. Have a n_______ day.

3. Her n_______ Maria.

4. Is that a c________ phone?

5. His telephone n_______ is 8872560.

6. H_______ blouse is white.

7. I'm in Class 2. He's in Class 4. We are in d_______ classes.

8. His nose is big, b              mine is small.

9. I don't have a brother. I o              have a sister.

10. My m_______ skin is yellow.

3位老师带着43位学生去划船，每条船最多可以乘4个人．那么至少要租多少条船？

下列哪些因素可成为内源性感染的诱因（）

A.单纯性肋骨骨折

B.气管插管

C.留置导尿管

D.长期应用糖皮质类激素

E.大叶性肺炎

我国第一部用纪传体写作的通史是指( )

A．《史记》

B．《春秋》

C．《战国策》

D．《左传》

血中还原血红蛋白至少达多少时，皮肤黏膜可出现发绀

A．＞50g/L
B．＞55g/L
C．＞60g/L
D．＞70g/L
E．＞80g/L