普通型流脑临床特征性体征是皮肤（）
A.瘀点或瘀斑
B.水疱
C.黑痂
D.斑丘疹
E.脓肿
参考答案：A
It was not until I came here ____ I realized this place was famous for not only its beauty but also its weather.
A．who
B．that
C．where
D．before
扑救精密设备火灾，应选择（）灭火器。
A.清水
B.干粉
C.泡沫
D.二氧化碳
