问题
单项选择题
In the doldrums you can expect（）.
A.steady, constant winds
B.frequent rain showers and thunderstorms
C.steep pressure gradients
D.low relative humidity
答案
参考答案：B
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In the doldrums you can expect（）.
A.steady, constant winds
B.frequent rain showers and thunderstorms
C.steep pressure gradients
D.low relative humidity
参考答案：B
残根，有冠心病史，近两年来发作，测血压21.3～12.1kPa（160/90mmHs），在拔