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【单选题】
关于亚健康描述 不正确 的是A.
处于亚健康状态者，不能达到健康的标准
B.
亚健康者符合现代医学有关疾病的亚临床诊断标准
C.
表现为一定时间内的活力降低、功能和适应能力减退的症状
D.
其发生与不断增大的社会压力有直接关系
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反馈参考答案：
举一反三
【单选题】In a diesel engine, when refitting piston rings you should ①check the ring gap at the smallest diameter of the cylinder ②remove carbon from the ring groove
A.
①
B.
②
C.
①②
D.
neither ① nor ②
【单选题】In a diesel engine, when installing new piston rings it is important to check_______Iring gap clearance IIside clearance
A.
I only
B.
II only
C.
both I and II
D.
neither I nor II
【单选题】The scavenging air ports are located at such a height that they are just exposed by the _______of the piston when the piston is in the bottom dead center position.
A.
lower edge
B.
piston ring
C.
upper end
D.
skirt
【简答题】As the piston again reaches BDC, the exhaust valve opens, but the intake valve remains closed. The piston moves upwards on the exhaust stroke to force the burnt gases out of the cylinder through the e...
【简答题】When the piston move to its highest position inside the cylinder, we can say it is at Top Dead Center (TDC).(翻译)
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