采集尿培养标本的操作正确的是：（）
A. 取晨起第一次尿
B. 用导尿法取标本
C. 外阴严格消毒后留取中段尿
D. 采集后立即送验
E. 取5-10ml
What does the red colour of the five –star flag symbolise?
A. unification
B. stabilization
C. revolution
Which country is not bordered by China?
A. Nepal
B. Japan
C. The Republic of Korea
What are the topographical features in China?
A. with highlands in the west and plains in the east
B. with plains in the west and highlands in the east
C. with plains and basins in the west
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