国际通用的SOS求救信号是三次短闪，三次长闪，三次短闪。
参考答案：对
The voters were overwhelmingly against the candidate______proposals called for higher taxes.
A．who
B．whose
C．whom
D．which
何项为羊水过多（）。
A．2000ml
B．＞2000ml
C．1000ml
D．500ml
E．＜300ml
