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【单选题】

S1:Hi, Chief, it's your good time now.S2:Really miss you. Have you completed your adjustment to night vision?S1:I can catch you without any difficulty.S2:OK. Now the ship is approaching Gibraltar Strait, and will enter traffic separation scheme soon.S1:What is the heading and speed?S2:Heading sets 080 (zero eight zero) degrees, speed over ground 18 knots, check up gyro and standard compass, +2 degrees in difference.S1:Good, the ship is in her own way.S2:The wind is soft and visibility is not so good. Sometimes mist appears.S1:Understood.S2:Port radar is working at 12 miles scale. There is a lot of traffic nearby.S1:Let me have a look. How about the port bow vessel, 7 miles away?S2:She is a head-on vessel, no conflict with us till now.S1:I see.S2:Navigational lights work well and all navigational and safety equipment are in good condition.S1:Alright. Have any special instructions?S2:That's all. If there is any question, please call the captain immediately. .Q1:Who is the relieving officer?

A.
Captain.
B.
The Chief Officer.
C.
The Third Officer.
D.
The Second Officer.
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【单选题】欲研究文章难度对不同年级的小学儿童阅读理解的影响,该研究中的自变量是

A.
文章难度和阅读理解
B.
年级和年龄
C.
阅读理解和年级
D.
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A.
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B.
数据库中的数据具有较小的数据冗余
C.
数据库中数据存储结构的变化不会影响到应用程序
D.
由于数据库是存储在磁盘上的,因此用户在访问数据库时需要知道其存储位置

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A.
出生率
B.
均寿命
C.
患病率
D.
发病率
E.
死亡率