更多“建筑外墙金属窗、塑料窗的质量性能检验主要有（）”相关的问题
无论有没有高血压，所有人群均应该做好高血压的自我健康管.理。（)
是
否
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The use of heat pumps has been held back largely by skepticism about advertisers' claims that heat pumps can provide as many as two units of thermal energy for each unit of electrical energy used, thus apparently contradicting the principle of energy conservation. Heat pumps circulate a fluid refrigerant(致冷剂) that cycles alternatively from its liquid phase to its vapor phase in a closed loop. The refrigerant, starting as a low-temperature, lowpressure vapor, enters a compressor 'driven by an electric motor. The refrigerant leaves the compressor as a hot, dense vapor and flows through a heat exchanger called the condenser, which transfers heat from the refrigerant to a body of air. Now the refrigerant, as a high-pressure, cooled liquid confronts a flow restriction which causes the pressure to drop. As the pressure falls, the refrigerant expands and partially vaporizes, becoming chilled. It then passes through a second heat exchanger, the evaporator, which transfers heat from the air to the refrigerant, reducing the temperature o{ this second body of air. Of the two heat exchangers, one is located inside, and the other one outside the house, so each is in contact with a different body of air: room air and outside air, respectively. The flow direction of refrigerant through a heat pump is controlled by valves. When the refrigerant flow is reversed, the heat exchangers switch function. This flow-reversal capability allows heat exchangers switch function. This flow-reversal capability allows heat pumps either to heat or cool room air. Now, if under certain conditions a heat pump puts out more thermal energy than it consumes in electrical energy, has the law of energy conservation been challenged? No, not even remotely: the additional input of thermal energy into the circulating refrigerant via the evaporator accounts for the difference in the energy equation. Unfortunately, there is one real problem. The heating capacity of a heat pump decreases as the outdoor temperature falls. The drop in capacity is caused by the lessening amount of refrigerant mass moved through the compressor at one time. The heating capacity is proportional to this mass flow rate: the less the mass of refrigerant being compressed, the less the thermal load it can transfer through the heat-pump cycle. The volume {low rate of refrigerant vapor through the single-speed rotary compressor used in heat pumps is approximately constant. But cold refrigerant vapor entering a compressor is at lower pressure than warmer vapor. Therefore, the mass of cold refrigerant—and thus the thermal energy it carries—is less than ii the refrigerant vapor were warmer before compression. Here, then, lies a genuine drawback of heat pumps: in extremely cold climates—where the most heat is needed—heat pumps are least able to supply enough heat.The primary purpose of the passage is to ______.A．explain the differences in the working of a heat pump when the out-door temperature changesB．contrast the heating and the cooling modes of heat pumpsC．describe heat pumps, their use, and {actors affecting their useD．advocate the more widespread use of heat pumps
A.B.C.D.E.F.TheG.A．explainH.contrastI.describeJ.advocate
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曲轴转一周，活塞移动（）个行程。
A、一
B、三
C、两
D、四
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我国《预算法》规定,地方各级政府本级预算分别由( )审查批准。
A. 全国人民代表大会 B. 全国人民代表大会常务委员会 C. 本级人民代表大会 D. 本级人民代表大会常务委员会
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18岁患者，男性，上感一天后出现突发肉眼血尿，持续4天后肉眼血尿消失，无浮肿，查尿常规尿蛋白阴性，红细胞（+），血压90/60mmHg，血红蛋白144g/L，肌酐77mmol/L。本例如为IgA肾病，则主要和下列哪种疾病鉴别（ ）
A.过敏性紫癜 B.Alport综合征 C.糖尿病肾病 D.多发性骨髓瘤 E.以上都不是
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安全色中，绿色意思为()
A.禁止
B.指令
C.警告
D.安全
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某炼油厂的塔器分段运至现场后，需要重新组焊，它的安装可以由______承担。
A.具备1级压力容器安装许可证单位
B.具备GA1级压力管道安装许可证的单位
C.具备GC1级压力管道安装许可证的单位
D.该设备的制造单位
E.具备A3级压力容器组焊许可证的单位
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在数字通信中,产生误码的主要原因有( )
A. 由传输特性不良引起的码间串扰B. 信号的传输速率太低C. 传输中叠加的加性噪声D. 传输中的乘性告饶
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归因的偏差包括（）。
A . 首因效应与近因效应
B . 基本归因错误
C . 行动者和观察者偏差
D . 防御性归因偏差
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市场风险报告应当包括（）内容。
A．盈亏情况
B．内部和外部审计情况
C．市场风险经济资本分配情况
D．市场风险政策和程序的遵守情况
E．市场管理机构
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执行如下程序段后，变量x、y的值分别为（）。 x=2 y=3 if x>y then x=x-y print x，y else y=y-x print y，x end if
执行如下程序段后，变量x、y的值分别为（）。
x=2
y=3
if x>y then
x=x-y
print x，y
else
y=y-x
print y，x
end if
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BBU-RRU用两路光纤资源负荷分担时，需配置两条光纤射频资源，两条配置中BBU光口号分别为1、2，而RRU级联号均为0。
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当有雷电的时候，或被测物带电时，应严格禁止使用地阻仪进行测量工作。
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男性，30岁，上腹痛5年，疼痛多在空腹发作，进食缓解，有时夜间痛，BAO 9mmol/h高于正常，哪一个治疗方案最佳()
A．甲氰咪胍+庆大霉素
B．庆大霉素+胶体铋
C．生胃酮+胶体铋
D．洛赛克(Omeprozo1)+胶体铋
E．硫糖铝+庆大霉素
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企业在对账时，应核对（）。
A.企业各种账簿记录与有关记账凭证
B.企业各种账簿之间
C.企业各种合同之间
D.企业各种财产物资和债权、债务的账面余额与其实存数
E.企业会计账簿记录与会计报表
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