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【多选题】
下列关于主族元素的说法正确的是A.
主族元素的原子核外电子最后填入的能级是s能级
B.
主族元素的原子核外电子最后填入的能级是s能级或p能级
C.
主族元素的价电子数有可能超过最外层电子数
D.
主族元素的最高正价一般等于该元素所在主族的族序数
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【单选题】When your vessel is proceeding to congested waters, ( ) is used to determine the exact ranges of other ships or objects in the vicinity.
A.
DF
B.
Satellite Navigator
C.
GPS
D.
Radar
【多选题】下列关于服务价值的论断哪些是正确的？
A.
从企业角度看，服务价值指顾客的服务消费能够为企业贡献的价值，即企业的收入扣除费用之后的部分。
B.
从顾客角度看，服务价值指顾客感知到的价值，即顾客对自己付出的成本和获得利得的整体评价。
C.
服务价值是构成顾客总价值的重要因素之一。
D.
服务价值是指顾客为购买某一产品或服务所期望获得的一组利益。
【单选题】When your vessel is proceeding to the area of traffic density, ____ is used to determine the exact ranges of other ships or objects in the vicinity.
A.
Radar
B.
GPS
C.
DF
D.
satellite navigator
【单选题】When your vessel is on or near the path of an approaching tropical storm the（）.
A.
wind direction remains steady
B.
wind speed increases
C.
barometer falls
D.
All of the above
【单选题】When your vessel is proceeding to the area of traffic density, ___ _ is used to determine the exact ranges of other ships or objects in the vicinity
A.
radar
B.
GPS
C.
AIS
D.
satellite navigator
【单选题】When your vessel is proceeding to the area of traffic density,（）is used to determine the exact ranges of other ships or objects in the vicinity.
A.
radar
B.
GPS
C.
DF
D.
satellite navigator
【单选题】When your vessel is proceeding to the area of traffic density _____is used to determine the exact ranges of other ships or objects in the vicinity.
A.
Satellite Navigator
B.
GPS
C.
DF
D.
Radar
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