【单选题】Why are old ships liabilities to ship-owners in the United States?
A.
The ship-owners have to pay taxes for dissecting their ships.
B.
They must clean of the ships' toxic materials before sending them to dry docks.
C.
Shipyards pay very little for the old ships.
D.
They must pay to have their ships dismantled.
【单选题】0223011 电路如图所示,已知 U S = 12V , R 1 = R 2 = 8Ω 。将图 (a) 中的电路等效成为图 (b) 中的电压源,则其中的 U es 和 R 0 分别为 ( ) 。
【单选题】电路如图所示,已知 U S = 12V , R 1 = R 2 = 4Ω 。将图 (a) 中的电路等效成为图 (b) 中的电压源,则其中的 U es 和 R 0 分别为 ( ) 。
【多选题】在抽样中当样本容量和抽样方法确定后( )。
【判断题】钳形电流表是一种用于测量正在运行中电路交流电流大小的仪表。
【单选题】Why does a ship contact the port?
A.
To know the condition of the port.
B.
To order a pilot and tugs.
C.
To have a berth arranged.