标准电压-48V的电信设备，其受电端子电压变动范围为（）。
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MV ATLANTIC 0200UTC POSN 33.55N 127.22E COURSE 088 DEGS SPEED 12.5 KTS SAILOR FELL FROM MAST SERIOULY WOUNDED AT HEAD. This cable says that（）.
A. the wounded had nothing wrong with his head
B. the injury was not serous
C. the injury happened at the mast head
D. a sailor injured at his head
金融业的（）和内在的（），从客观上需要审慎监管。
A. 高风险性；不稳定性
B. 低风险性；不稳定性
C. 高风险性；稳定性
D. 低风险性；稳定性
－Can you turn down the radio, please? －（）
A. I’m sorry, I didn’t realize it was that loud
B. Please forgive me
C. I’ll keep it down next time
按照钢构件制作工艺的要求，低合金结构钢在加热矫正后应（）。
A. 水冷却
B. 自然冷却
C. 油冷却
D. 风冷
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