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【单选题】
过空间一点的三条直线两两垂直，则它们确定的平面互相垂直的对数有（ ）。A.
0
B.
1
C.
2
D.
3
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【单选题】If the shipment date is "first half of August" in the L/C,then the goods must be shipped( ).
A.
before August 15th
B.
after August 15th
C.
August 1st to 15th,all dates inclusive
D.
August 1st to 15th,exchding August 1st
【简答题】If the shipment date is“on or about May 10”，then the goods can be shipped between（ ）．
【判断题】If the shipment date is “on or about May 20”, then the goods must be shipped before that date.（ ）
A.
正确
B.
错误
【单选题】If the shipment date is “first half of December” in the credit, then the goods must be shipped ( )
A.
before December 15th
B.
After December 15th
C.
December 1st to the 15th, all dates inclusive.
D.
December 1st to the 15th, excluding December 1st.
【判断题】If the shipment date is “on or about May 20”, then the goods must be shipped before that date.
A.
正确
B.
错误
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