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【单选题】
工频条件下三相异步电动机的额定转速为1450转/分,则电动机的磁对数为( )。A.
1
B.
2
C.
3
D.
4
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反馈参考答案：
举一反三
【简答题】请计算,整流滤波电路中,估算的输入与输出电压之间的比值。
【单选题】【单选】What is the main purpose of dunnage?
A.
To act as ballast for light vessels
B.
To provide ventilation and drainage for cargo
C.
To secure the tarpaulins in place
D.
To support weakened bulkheads
【单选题】S1:Have you laid the dunnage as instructed?S2:I think so.S1:What have you done with the bilges?S2:The bilges have been covered with planks.S1:Where did you find the dunnage planks? The planks you use ...
A.
It should be laid with one layer of dunnage.
B.
It should be laid with two layer of dunnage.
C.
It should be laid with one layer of mats.
D.
It should be laid with two layer of dunnage.
【单选题】What is dunnage?
A.
a slang term for a particular type of ocean liner
B.
a type of packaging material that is placed inside of boxes
C.
material that is used to block and brace products inside carrier equipment
D.
additional transportation fees that are charged to small shippers
【简答题】习题2.doc
【单选题】What is the main purpose of dunnage?
A.
to act as ballast for light vessels
B.
to provide ventilation and drainage for cargo
C.
to secure the tarpaulins in place
D.
to support weakened bulkhead
【单选题】What is the main purpose of dunnage? ___ .
A.
To act as ballast for light vessels
B.
To provide ventilation and drainage for cargo
C.
To secure the tarpaulins in place
D.
To support weakened bulkheads
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