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【单选题】
非水酸碱滴定不适用于测定( )。A.
在水溶液中不能直接滴定的弱酸、弱碱
B.
反应速度慢的酸碱物质
C.
难溶于水的酸碱物质
D.
强度相近的混合酸或碱中的各组分
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【简答题】剩余碘量法测定司巴比钠的含量
【单选题】What. action should a GMDSS radio operator take when SafetyNET distress or urgency messages are received by the vessel's EGC receiver?
A.
No immediate action is required.
B.
Aural and visual alarms are activated, and require manual deact.ivation.
C.
Transmission of acknowledgement should be achieved imm_ediately.
D.
Reset the EGC receiver imnediately.
【单选题】SafetyNET messages can be received by which of the following shipboard equipment?
A.
NAVTEX.
B.
MF and HF NBDP.
C.
EGC receiver.
D.
None of these
【单选题】EGC safetyNet transmits（）types of messages for mariners.
A.
four
B.
six
C.
five
D.
three
【单选题】By which of the following shipboard equipment can SafetyNET messages be received? .
A.
NAVTEX.
B.
MF and HF NBDP.
C.
EGC receiver.
D.
AIS receiver.
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