High water line
Low water line
Low water spring line
Tide level
第1题：
A. how do you know it?
B. why do you say so?
C. what do you mean by that?
第2题：
_____, boys like footballs.
A: Generally speaking
B: General speaking
C: Generally spoken
D: Speaking generally
第3题：
The centerline of a standard "Shewhart' control chart represents:
A . the process target
B . the nominal dimension specified by the customer
C . the nominal dimension specified by the designer
D . the true process average or mean
E . the process sample average or mean
第4题：
Generally，______ are used as the track charts on the high sea，______ are used for harbors，inland waters and coastal areas．
A.Mercator charts／Loran charts
B.Admiralty charts／Routeing charts
C.large scale charts／small scale charts
D.small scale charts／large scale charts
第5题：
X线平均波长(λmean)与最短波长(λmin)的关系是
A．λmean=3λmin
B．λmean=2.5λmin
C．λmean=2λmin
D．λmean=1.5λmin
E．λmean=λmin
第6题：
X线平均波长(λmean)与最短波长(λmean)的关系是
A.λmean=3λmin
B.λmean=5λmin
C.λmean=2λmin
D.λmean=5λmin
E.λmean=λmin
第7题：
x线平均波长(λmean)与最短波长(λmin)的 关系是
A.λmean =3λmin
B.λmean =2．5λmin
C.λmean =2λmin
D.λmean =l．5λmin
E.λmean=λmin
第8题：
187 The centerline of a standard "Shewhart' control chart represents:
A. the process target
B. the nominal dimension specified by the customer
C. the nominal dimension specified by the designer
D. the true process average or mean
E. the process sample average or mean
第9题：
From 1800 to 1968 Admiralty charts were published with fathoms and feet as the units for depths，and feet as the units for height．Since 1968 Admiralty charts ________ to meters，thus conforming with charts of most other countries．
A.gradually converted
B.have been gradually converted
C.has been gradually converted
D.is gradually converted
第10题：
The datum from which the predicted heights of tides are reckoned in the tide tables is ______.
A.mean low water
B.the same as that used for the charts of the locality
C.the highest possible level
D.given in table three of the tide tables