喷射定时就是要求柴油机的喷射系统具有准确（）。
A、喷油提前角
B、喷油量
C、喷油持续时间
D、A＋C
参考答案：D
Since Jack was laid off from his job three months ago, he a new one, but without luck.
A．looked for
B．bad looked for
C．is looking for
D．has been loking for
患者尿频量多，混浊如脂，尿有甜味，口干舌燥，舌红，脉沉细数。治法宜用（）
A.清利湿热
B.清热化湿
C.滋阴固肾
D.健脾益肾
E.滋肾养阴
