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1.间接回波的方位通常在（）
单选题A. 船首标志线上~||~船尾线方向~||~盲区内~||~阴影扇形内
2.在海平面上温度为15℃，高度每升（）高英尺，降低2℃
单选题A. 1000~||~2000~||~3000~||~4000
3.In beaufort wind scale，sea state with moderate waves，taking longer form，many whitecaps and some spray，is named as______．
单选题A. Strongbreeze~||~Freshbreeze~||~Stronggale~||~Gale
4.Fishing stake, the position of which frequently _____, exist in the area covered by this chart.
单选题A. removed~||~altered~||~corrected~||~Converted
5.台风眼区的天气特征为（）
单选题A. 风力最大暴雨~||~风力较弱暴雨~||~风力较大无雨~||~风力较弱无雨
6.Navigational warnings and weather bulletins for shipping ______ from Singapore Radio.
单选题A. broadcast~||~broadcasted~||~arebroadcast~||~arebroadcasted
7.浓雾警报，则海面能见度为（）。
单选题A. 05～5nmile~||~小于05nmile~||~小于2nmile~||~2～5nmile
8.通常在近地层风速具有明显的日变化特征，主要表现为（）
单选题A. 白天小夜间大~||~白天大夜间小~||~白天和夜间一样大~||~昼夜均小
9.硬铁部分所获得的磁性可以看做在相当长的时间内是稳定的，故称为（）
单选题A. 永久船磁~||~感应船磁~||~磁罗经~||~自差罗经
10.使用分道通航制的船舶，拟定航线时应：所选航线尽量与分道内船舶总流向相一致，并注意让开分隔带和分隔线，双向航路内的航线应尽量靠近航道的（）
单选题A. 左侧~||~右侧~||~中间~||~两边
11.If a weather bulletin shows the center of a low pressure system to be 100 miles due east of you, what winds can you expect in the Southern Hemisphere？ ______.
单选题A. South-southwesterly~||~North-northwesterly~||~South-southeasterly~||~North-northeasterly
12.MODERATE WAVES, TAKING A MORE PRONOUNCED LONG FORM;MANY WHITE HORSES ARE FORMED. This sea condition is likely to be termed ______.
单选题A. neargale~||~moderatebreeze~||~freshbreeze~||~strongbreeze
13.AIS目标的缺省显示为（）
单选题A. 休眠目标~||~激活目标~||~危险目标~||~丢失目标
14.下列正确的说法是（）
单选题A. 毛毛雨落在水面有波纹，落在甲板上无湿斑~||~毛毛雨落在水面无波纹，落在甲板上有湿斑~||~小雨落在水面会激起波纹或水花，落在甲板上可留下湿斑~||~小雨落在水面无波纹，落在甲板上可留下湿斑
15.阵性降水历时短，强度变化很快，骤降骤止，天空时明时暗，降水来自浓积云和（），并常伴有阵性大风等特点。
单选题A. 积雨云~||~淡积云~||~雨层云~||~层云
16.因霾使天空的云量、云状全部或部分不明时，（），相应栏记录可辨明部分的云状;若透过这些现象能完全辨明云量、云状时，则按正常情况记录。
单选题A. 低云状栏记"∞"，总低云量栏记"-"~||~云状栏记"∞"，总低云量栏记10~||~云状栏记"-"，总低云量栏记"-"~||~云状云量栏均不作记录
17.In the daytime, you see a large sailing vessel on the beam. You know that she is also propelled by machinery if she shows ______.
单选题A. ablackball~||~ablackcone~||~twoblackcones~||~abasket
18.The circular steel structure installed around the propeller of a towboat is the______．
单选题A. nozzle~||~shroud~||~strut~||~Hood
19.A vessel on the high seas that is not under command shall display which of the following day signals？ ______
单选题A. Twoblackballs~||~Threeblackballs~||~Tworedballs~||~Threeredballs
20.根据（）的不同特征又可以将对流层分为行星边界层或摩擦层和自由大气。
单选题A. 气温~||~大气运动~||~湿度~||~气压
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