畅通气道的方法有哪些？
参考答案：
压额提颏法；清除异物；创伤推颌法。
—Do you know _____?
—Sorry, I don’t know.
A．what’s the population of Japan
B．what the population of France is
C．how much of the population of Japan is
D．how many is the population of France
蓼大青叶的气孔类型为
A．平轴式
B．直轴式
C．不等式
D．不定式
E．环式
