我国电信行业最先在()引入市场竞争机制。
A.基础网络领域
B.非基础电信业务领域
C.IP电话业务领域
D.固定电话业务领域
参考答案：B
It was _____ that caused him to serve dinner an hour later than usual.
A．we being late
B．our being late
C．we were too late
D．because we were late
某患者有高血压病史5年，蛋白尿3年，1年前医师告诉她有肾损害，近l周来因恶心、呕吐和厌食就诊。血气分析：pH7．30，HC039mmol／L，PACO220mmHg。该患者应诊断为()
A．代谢性酸中毒
B．呼吸性酸中毒
C．代谢性碱中毒
D．呼吸性碱中毒
E．混合性酸中毒
