《建筑桩基技术规范》中，预应力高强混凝土管桩代号为（）。
A. PC
B. PHC
C. PS
D. PHS
When can routine communications be resumed when radio silence has been imposed?（）
After determining that the frequency or channel appears to be no longer in use
B. After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communications
C. Routine communications can resume after the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded
D. If，in the Master's opinion，communications on that frequency will interfere with emergency communicatio
POS分期交易金额关于信用卡支付的小费金额和预授权交易金额的规定是（）
A. 分期交易金额不包括使用信用卡支付的小费金额和预授权交易金额。
B. 分期交易金额包括使用信用卡支付的小费金额和预授权交易金额。
电容型绝缘的电流互感器，其一次绕组（）、铁芯的引出端子应可靠接地。
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