进站点灯电路中，DJ的5、6是指DJ插座的（）接点。
具有256级灰度、分辨率为1024*1024个象素阵列的光栅扫描式显示器需要（）KB的缓冲器。
If you were being assisted by an icebreaker and he sent you the single letter Q，he would be telling you（）.
A. that he has his engines in reverse
B. that he is shortening the distance between vessels
C. to shorten the distance between vessels
D. that his vessel is healthy
乙酰水杨酸原料需要作澄清度检查，这项检查主要是检查（）。
A. 酚类杂质
B. 游离水杨酸
C. 游离乙酸
D. 苯酯类杂质
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