单选题It is（）for mariners to combine the SART with a float-free satellite EPIRB.AessentialBcompulsoryCoptionalDinadvisable
单选题
It is（）for mariners to combine the SART with a float-free satellite EPIRB.
A
essential
B
compulsory
C
optional
D
inadvisable
参考解析
解析：
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相关考题：
符合CCIR628建议的SART,有一根长绳与之连接,以供()使用。 A、遇难幸存者系在身上B、便于把SART帮扎固定在船上C、使SART有良好的接地，避免发射时对人产生伤害D、增加SART的有效发射功率
SART的信号发射是_____。A.SART浸入水后就发射B.SART收到X波段雷达的触发脉冲就启动连续发射C.SART收到X波段雷达站的触发脉冲就发射一次D.SART浸水后，同时收到X波段雷达的触发脉冲，就连续发射
The charts sold are of ______.A.newly edition with up to date correction and in reasonable pricesB.the current edition and incorporate the last Notices to Mariners correctionC.the current edition and incorporate the latest Notices to Mariners correction at the time of saleD.brand-new one with up to date correction and clean writing
Admiralty Notices to Mariners，containing important information for the mariners and enabling them to keep their charts and books corrected for the latest information，are issued daily and published in ______.A.Weekly EditionsB.Quarterly EditionsC.Annual EditionsD.Monthly Editions
The Local Notice to Mariners is usually published ______.A.dailyB.weeklyC.monthlyD.semiannually
How can a SART’s effective range be maximized?______A.The SART should be placed in water immediately upon activation.B.The SART should be held as high as possible.C.Switch the SART into the “high” power position.D.If possible, the SART should be mounted horizontally so that its signal matches that of the searching radar signal.
GMDSS要求船舶必须配备（）.A、DSC和SESB、SART、TWO-WAY VHF和EPIRBC、SART、EPIRB和518NAVTEXD、SART、TWO-WAY VHF、EPIRB和518NAVTEX，VHF DSC
SART的信号发射是（）。A、SART浸入水后就发射B、SART收到X波段雷达的触发脉冲就启动连续发射C、SART收到X波段雷达站的触发脉冲就发射一次D、SART浸水后，同时收到X波段雷达的触发脉冲，就连续发射
单选题The charts sold are of （）.Anewly edition with up to date correction and in reasonable pricesBthe current edition and incorporate the last Notices to Mariners correctionCthe current edition and incorporate the latest Notices to Mariners correction at the time of saleDbrand-new one with up to date correction and clean writing
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单选题符合CCIR628建议的SART，有一根长绳与之连接，以供（）使用A遇难幸存者系在身上B便于把SART帮扎固定在船上C使SART有良好的接地，避免发射时对人产生伤害D增加SART的有效发射功率
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