单选题
发布日期:2021-03-22
bypass exhaust gas at high loads to prevent excessive back pressure
bypass a portion of the exhaust gas at peak loads for better efficiency
recycle exhaust gas to the turbocharger
minimize moisture condensation in the boiler gas passages at low loads
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男性,8岁。面部多处暗红色、大小不等、形状不规则的扁平斑片,不高出皮肤表面,用手压之可褪色,放松后又恢复原色。根据患儿情况,治疗宜采取()。
根据保健要求,出生1个月婴儿访视次数是()
EPSS是指()。
货币必要量的决定因素有()
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下列哪个不属于机车的特征牵引力()。
氨基糖苷类抗菌药物引起的不良反应不包括()
混凝土试块做成边长为()的立方体。
一列火车从九龙开往北京,下列对火车与铁轨的磨损程度叙述正确的是( )。
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