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【单选题】
请问船位差是（）。
A.
推算船位到观测船位的距离
B.
观测船位到推算船位的距离
C.
推算船位到观测船位的时间
D.
观测船位到推算船位的时间和方向
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【单选题】设 , 为任意非零向量,下列结论中正确的是( ).
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【单选题】The river is too dirty ______.
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to swim in
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for swimming
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to swim
D.
for swimming in
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【单选题】This river is too wide for the swimmers _________.
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to swim across
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【判断题】( )聚氯乙烯被广泛用于各种包装、容器,如食品保鲜膜等。
A.
正确
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【单选题】设 , 为任意非零向量,下列结论中正确的是( )
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