储能器中充装的气体只能用()。
参考答案:氮气
关于人工呼吸不妥的是
A.置婴儿仰卧位,头尽量后仰
B.一般采用口对口人工呼吸
C.幼婴可以口对口鼻人工呼吸
D.牙关紧闭者可以采用口对鼻人工呼吸
E.吹气与排气时间之比是2:1
One of the real services of the historical novel is not that it can be a substitute for history, but that it can be a(n) extension.
A. compliment B. supplement C. instrument D. replacement