转换期限是指可转换债券转换为普通股票的起始日至结束日的期间。 ( )
参考答案：对
下列哪种情况是利用紫外线特征工作的 [ ]
A．电视机遥控器前端的发光二极管
B．钞票或商标的防伪标志
C．步枪瞄准器上的夜视仪
D．医院手术室里用于灭菌的消毒灯
Heat is always being transferred in one way or another, () there is any difference in temperature.
A. since
B. where
C. after
D. as soon as
