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【单选题】
在减压回路中，减压阀调定压力为pj，溢流阀调定压力为py，主油路暂不工作，二次回路的负载压力为pL。若py>pj>pL，减压阀进、出口压力关系为（ ）。A.
进口压力p1＝py，出口压力p2＝pj
B.
进口压力p1＝py，出口压力p2＝pL
C.
p1＝p2＝pj，减压阀的进口压力、出口压力、调定压力基本相等
D.
p1＝p2＝pL，减压阀的进口压力、出口压力与负载压力基本相等
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【简答题】A. It is difficult for Alison to get her children to go to sleep again at night. B. The neighbors' son always comes home very late. C. Alison finds it hard to complain to her new neighbors about their...
【单选题】Which of the following is not included in the common influencing factors for patient safety? ..........................................................................................( )
A.
Lack of nursing staff
B.
Emergency equipment is not in good condition or is not ready for use.
C.
The requirements of patients are difficult to achieve.
D.
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【简答题】difficult
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A.
11.A man so difficult to ____ must be hard to ____ . A．please…work
B.
be pleased…work
C.
please…work with
D.
be pleased…work with
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