预防破伤风有哪些措施?
参考答案:
①创伤后早期彻底清创,改善局部循环,是预防破伤风的关键;
②通过人工免疫,产生较稳定的免疫力。人工免疫有自动和被动两种方法。
The amount of money they had saved reached 30,000 dollars.
A.as many as
B.as far as
C.as high as
D.as much as
国籍是指一个公民
A.道德上的身份
B.政治上的身份
C.法律上的身份
D.经济上的身份