等渗性缺水的主要临床表现是()
A.口渴、少尿
B.高热
C.血压下降、周围循环衰竭
D.头痛、嗜睡
E.腹胀、食欲不振
参考答案:C
—Do you often do chores at home?
—Yes. I think it's ______, but I have to help my mother. [ ]
A. relaxing
B. boring
C. important
D. great
当三相电压对称时,星型联接的线电压的相位较它相应的相电压()。
A.超前30°
B.滞后30°
C.超前120°
D.滞后120°