对怀疑有颈椎骨折的伤员进行人工呼吸应采用什么方法?
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Late fuel injection timing is indicated by ()
A. lower than normal cylinder pressure and low exhaust temperature
B. lower than normal cylinder pressure and high exhaust temperature
C. higher than normal cylinder pressure and low exhaust temperature
D. higher than normal cylinder pressure and high exhaust temperature
什么是二进制?在计算机中,字符、数字是如何编码的?
将三相对称负载以星形(Y)方式接入对称三相四线制电源,若将中线断开,则()
A. 三相负载仍能正常工作
B. 三相负载中的电流均为零
C. 有的负载端电压过高,有的负载端电压过低
D. 二相负载正常工作,一相负载不能正常工作