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【单选题】
已知抛物线的方程为标准方程，焦点在x轴上，其上一点P(-3,m)到焦点距离为5，则抛物线方程为( )A.
y 2 ='8x'
B.
y 2 =-8x
C.
y 2 ='4x'
D.
y 2 =-4x
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【单选题】No damage of any kind ______ to navigation or navigation facilities．
A.
should be done to
B.
should not be done to
C.
must be done with
D.
must not be done with
【简答题】牵拉口角向后的肌为___。
【单选题】According to the principle of operation, navigation system can be divided into instrument navigation systems, , inertial navigation systems, astronomical navigation systems and integrated navigation ...
A.
Independent navigation systems
B.
Dependent navigation systems
C.
Short range navigation systems
D.
radio navigation systems
【单选题】Navigation details including soundings, nature of the bottom, navigational marks etc. are shown in ____
A.
small-scale charts
B.
medium-scale charts
C.
large-scale charts
D.
natural scale charts
【简答题】比较溢流阀、减压阀、顺序阀的异同点
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