按照JB2599-85标准规定,铅蓄电池产品型号第一段数值为6,表示蓄电池的()。
A.额定电压为6V
B.额定电压为12V
C.额定电流为12A
参考答案:B
—Why did you come to school late this morning?
—______ I watched the Football World Cup until 12 o'clock last night.
[ ]
A. If
B. Because
C. Since
D. though
采用Warthin-Starry进行胃幽门螺杆菌染色时,胃幽门螺杆菌呈()
A.黄色
B.黑色
C.绿色
D.红色
E.蓝色