不等式ax2+4x+a＞1-2x2对一切x∈R恒成立，则实数a的取值范围是（ ）

下列变化属于物理变化的是

A．苹果腐烂

B．蜡烛熔化

C．生物呼吸

D．白磷自燃

以实施的（）的名义收取钱物，不出具任何票据的，给予开除处分

A.行政事业性收费

B.罚没

C.礼尚往来

D.工作需要

男性患者，30岁，3天前受凉后出现寒战、高热，伴咳嗽、咳铁锈色痰，并逐渐加重，气促、烦躁、四肢厥冷。查体：T39.5℃，P120次／分，R28次／分，BP75/45mmHg，神志模糊，口唇发绀，右肺上野叩诊浊音，语颤增强，可闻及支气管呼吸音。胸片示右肺上野可见大片状致密阴影。血常规：WBC15×10/L，中性粒细胞92%。

对于该患者的治疗，下面哪些是正确的（）。

A.机械通气

B.给予呼吸兴奋剂

C.应用抗生素

D.纠正水、电解质和酸碱紊乱

E.镇静、止咳

F.胸腔引流

G.补充血容量

H.解痉、平喘

I.应用血管活性药物

In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet.

The key to SNMP (71) is its simplicity. It has a small command set that does a good job of collecting information from (72) any network device. In a SNMP environment, (73) of the work is handled by the network management system. Devices that are being managed are not (74) with processing (75) that might affect their performance.

72（）

A．many

B．almost

C．a lot of

D．nearly

说明水的BOD₅概念和测定原理？