在出售公有住房的情况下，职工购房可实行分期付款，其首期不得低于实际售价的（）
A. 20％
B. 25％
C. 30％
D. 35％
查看答案
You are about to cross a narrow channel when you see an approaching vessel that can only be navigated safely within the channel.You should（）.
A. cross the channel as you are the stand-on vessel
B. cross only if the vessel in the channel is approaching on your port side
C. not cross the channel if you might impede the other vessel
D. sound the danger signal
EP镜架具有特殊记忆功能，加热到200度时施加外力可产生弹性变性。
A. 正确
B. 错误
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