DG270—140C给水泵中DG代表（），C代表（）。
参考答案：锅炉给水、扩大性能后的产品
Only when class began ______that he had left his book at home．
A．will he realize
B．he did realize
C．did he realize
D．had he realized
一贯煎中重用生地黄为君，意在（）
A.清热凉血
B.滋阴凉血
C.壮水制火
D.补益肝肾
E.滋养肺肾
