发生破伤风芽孢梭菌感染是由于 A．吃了破伤风芽孢梭菌污染食物

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问题单项选择题

发生破伤风芽孢梭菌感染是由于

A．吃了破伤风芽孢梭菌污染食物
B．劳动时皮肤污染了污泥
C．破伤风病人污染的空气传播
D．受伤后破伤风杆菌侵入到伤口内
E．经昆虫媒介的传染

答案

参考答案：D

填空题

根据首字母和汉语提示完成单词。

1.That musician has w______ many songs?

2.—Has your father been a______?

—Yes, he has been to many countries.?

3. Zhang Ziyi is very famous.He Meifeng has always wanted to m______her?

4. How many tickets can you buy if they are all s______ out?

5. Wei Ming's father is an Air China captain, so he has f______ to many different countries.

填空题

【15】是一种关系操纵语言，它的操作对象和操作结果均为关系。