船台可使用（）指令来获取海岸电台开放的所有无线电传指令（COMMANDS）.
A.INF+
B.LIST+
C.HELP+
D.MSG+
参考答案：C
I've been writing this report ________ for the last two weeks, but it has to be handed in tomorrow.[ ]
A. finally
B. immediately
C. occasionally
D. certainly
作为机体获得对HBV免疫力及乙型肝炎患者痊愈的指标是
A．HBsAg(+)B．抗-HBs(+)C．HBeAg(+)D．抗-HBc(+)E．抗-HBe(+)
