在能见度不良的水域中航行,对装有可使用雷达的船舶在决定安全航速时的首要因素是()。
A. 雷达的特征
B. 能见度情况
C. 航道条件
D. 通航密度
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装有可使用雷达的船舶在决定安全航速时,应考虑()。①雷达设备的局限性;②所选用的雷达距离标尺;③天气对雷达精度的影响;④雷达的生产商。
A. ①
B. ①③
C. ①②③
D. ①②③④
骨质是骨的主要成分,按结构可分为骨密质、骨松质两种类型。
Accountant: Thanks for the 1 ____________________ . They all look good except for one.Consultant: 2 ____________ one is that?Accountant: It’s the CD/DVD drive. 3 ____________why do I need a CD/DVD drive?Consultant: Well, you may want to view and store 4 ____________ files or install large applications.Accountant: Hmm ... I don’t know 5 ____________ that still uses those.Consultant: OK. You could just 6 _________ a flash drive.Accountant: Yes. I think most people use flash drives.Consultant: That’s true, but some people still use CDs/DVDs.
The man thinks no one uses drives.
A. 对
B. 错