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【单选题】
吗啡主要通过激动下列哪种受体产生镇痛作用:( )A.
ε受体
B.
κ受体
C.
μ受体
D.
σ受体
E.
δ受体
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反馈参考答案：
举一反三
【单选题】If over a period of time, the oi1 film partially disappears, so that dry areas are formed on the cylinder wall, these areas and the piston surfaces will by frictional interaction, become finely scuffe...
A.
micro-seizure
B.
sticking
C.
scratched
D.
breakage/collapse
【单选题】The piston rings if found worn out _____ and supplied by shipchandler.
A.
must replace
B.
must to be equipped
C.
has to be repaired
D.
have to be renewed
【单选题】If due to thick and hard deposits of carbon, the piston rings cannot move freely in their grooves, dark areas will often appear on the upper part of the cylinder wall (may not be the risible at port i...
A.
micro-seizure
B.
sticking
C.
scratched
D.
breakage/ollapse
【判断题】“仁者爱人”是儒家核心思想之一,孔子之所以提出“仁者爱人”,是想表达“以人为本”的理念。 仁者,是指充满慈爱之心,满怀爱意的人;是具有大智慧,人格魅力,善良的人。
A.
正确
B.
错误
【单选题】If due to thick and hard deposits of carbon, the piston rings cannot move freely in their grooves, dark areas will often appear on the upper part of the cylinder wall (may not be the risible at port i...
A.
micro-seizure
B.
sticking
C.
scratched
D.
breakage / collapse
【单选题】If the piston groove drain holes for the oil control rings become clogged, which of the following is likely to occur?
A.
The oil control rings will seal improperly and wear rapidly
B.
The piston will overheat due to insufficient lubrication
C.
Excessive oil will remain on the cylinder wall
D.
Light brown smoke will emanate from the engine exhaust
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