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【简答题】
有一单相半波可控整流电路，负载电阻R L ＝10Ω，直接由220V电网供电，控制角α＝60°。试计算整流电压的平均值、整流电流的平均值和电流的有效值，并选用晶闸管。
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【单选题】Sailing vessels are stand-on over power-driven vessels except ______.
A.
in a crossing situation
B.
in a meeting situation
C.
when they are the overtaking vessel
D.
on the inland waters of the PR China
【简答题】听音，判断，对的在下面画“√”，不对的画“×”。 1. 2. 3. 4. ( ) ( ) ( ) ( )
【简答题】A．To design vessels that could make long ocean voyages. B．To design vessels that could travel faster than those in use at that time. C．To design vessels that could explore the coastline of Portugal. D...
【简答题】听录音，正确的画“√”，错误的画“×”。 1. 2. 3. 4. 5. ( ) ( ) ( ) ( ) ( )
【单选题】Avoid this area. No possibility for vessels to turn
A.
It`s advisable for vessels to turn here
B.
It`s impossible for vessels to turn here
C.
It`s impossible for vessels to avoid this area
D.
It`s advisable for vessels to enter this area
【单选题】Sailing vessels are stand-on over power-driven vessels EXCEPT .
A.
in a crossing situation
B.
in a meeting situation
C.
when they are the overtaking vessels
D.
on the inland waters of the PR China
【简答题】听音判断，对的画“√”，错的画“×”。 1. 2. 3. 4. 5. ( ) ( ) ( ) ( ) ( )
【单选题】There is a ______ when one or more vessels are towing or pushing another vessel or vessels，provided that they are all involved in commercial activities and not in a salvage operation．
A.
private safety
B.
private maritime adventure
C.
common safety
D.
common maritime adventure
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