起动试验时，要求电流测量误差应不超过（）。
A.±5%
B.±10%
C.±3%
D.±2%
参考答案：A
既善于治疗吐衄便血，又善于治疗肝火上炎之头痛目赤的药物是（）既善于治疗吐衄便血，又善于治疗肺热咳嗽有痰的药物是（）
A.侧柏叶
B.地榆
C.大蓟
D.槐花
E.小蓟
Robert is away. He _______ America since last week.
A．has been to
B．has joined a club in
C．has studied in
D．has become a manager in
