题目内容

The SARTs works on _________

A. S-band
B. VHF-band
C. X-band
D. L-band

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Maritime Safety Information includes _________. ① meteorological warnings ②meteorological warnings and forecasts ③ other urgent safety related messages broadcast to ships

A. ①②
B. ②③
C. ①③
D. ①②③

Signals for locating will be transmitted by _________ in 9GHz band.

A. SART
B. DSC
C. NBDP
D. RT

胶粒电荷类型由( )电荷类型决定

A. 电位离子
B. 反离子
C. 扩散层
D. 吸附层

把0.05 mol/L的KBr溶液80 mL与0.0050 mol/L AgNO3溶液 20 mL混合制备AgBr溶胶, NaCl、MgSO4、Al(NO3)3对该溶胶的聚沉能力从小到大的顺序为( )

A. NaCl B. NaCl>MgSO4>AlCl3
C. NaCl D. NaCl=AlCl3