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【多选题】
衡量弯曲变形的基本量有()?A.
转角
B.
挠度
C.
弯矩
D.
剪力
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【简答题】已知函数f（x）= ，g（x）=alnx，a∈R。 （1）若曲线y=f（x）与曲线y=g（x）相交，且在交点处有共同的切线，求a的值和该切线方程； （2）设函数h（x）=f（x）-g（x），当h（x）存在最小值时，求其最小值φ（a）的解析式； （3）对（2）中的φ（a）和任意的a>0，b>0，证明： 。
【单选题】若曲线y＝x2＋ax＋b和y＝x3＋x在点(1，2)处相切(其中a，b是常数)，则a，b之值为[ ]．
A.
a＝2，b＝－1
B.
a＝1，b＝－3
C.
a＝0，b＝－2
D.
a＝－3，b＝1
【单选题】the distress traffic should,as a general rule,be initiated on the appropriate distress traffic channel in____in which the DSC alert was received.
A.
the same frequency
B.
the same band
C.
the same channel
D.
the same bank
【单选题】The distress traffic should, asa general rule, be initiated on the appropriate distress traffic channel in( ) in whichthe DSC alert was received.
A.
the same frequency
B.
the same band
C.
the same channel
D.
the same bank
【单选题】若曲线y＝x2＋ax＋b和2y＝－1＋xy3在点(1，－1)处相切，其中a，b是常数，则( )．
A.
a＝0，b＝－2
B.
a＝1，b＝－3
C.
a＝－3，b＝1
D.
a＝－1，b＝－1
【单选题】In a traffic separation scheme, when joining a traffic lane from the side, a vessel shall do so（）.
A.
only in case of an emergency or the engage in fishing within the zone
B.
as nearly as practical at right angles to the general direction of traffic flow
C.
at as small an angle as possible
D.
only to anchor within the zone
【单选题】In a traffic separation scheme, when joining a traffic lane from the side, a vessel shall do so_ .
A.
only in case of an emergency or to engage in fishing within the zone
B.
as nearly as practical at right angles to the general direction of traffic flow
C.
at as small an angle as possible
D.
never
【简答题】In general, traffic managers seek to improve ______________ so that trailer cubic capacity can be fully utilized。
【单选题】In a traffic separation scheme, when joining a traffic lane from the side, a vessel shall do so（）.
A.
at as small an angle as possible
B.
as nearly as practical at right angles to the general direction of traffic flow
C.
only in case of an emergency or to engage in fishing within the zone
D.
never
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