在低倍镜下观察到视野较暗,要想看到明亮的视野,此时应 [ ]
A.调节细准焦螺旋
B.调节粗准焦螺旋
C.选用大光圈
D.选用平面反光镜
答案:C
Who is the old woman? [ ]
A. She is Lucy's grandmother.
B. She is eight.
C. She is tired.
小李到银行购汇100美元,当日银行美元现钞买入价为7.8505,卖出价为7.9457,中间价为7.8981,小李需支付人民币()。
A、7945.7元
B、794.57元
C、785.05元
D、789.81元