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【简答题】
已知向量 a =（1，2）， b =（-2，3）， c =（4，1），若用 a 和 b 表示 c ，则 c =______．
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反馈参考答案：
举一反三
【单选题】Which of the following is NOT the Third Officer’s responsibility?
A.
The Third Officer takes charge of appropriate cargo watch in port.
B.
The Third Officer takes the medical duty on board a ship.
C.
The Third Officer is responsible for the maintenance and inspection of all life saving and firefighting equipment.
D.
The Third Officer is responsible for the maintenance of log and inventory book.
【单选题】Which of the following is NOT the Third Officer’s responsibility?
A.
The Third Officer takes charge of appropriate cargo watch in port.
B.
The Third Officer takes the medical duty on board a ship.
C.
The Third Officer is responsible for the maintenance and inspection of all life saving ang firefighting equipment.
D.
The Third Officer is responsible for the maintenance of log and inventory book.
【简答题】在“宽度比例”文本框中可以设置文字字符的高度和宽度之比,当宽度比例为1时,将按系统定义的高宽比书写文字;当宽度比例小于1时,字符会变 ;当宽度比例大于1时,字符则变 。
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