哪种类型的灯不能用做紧急照明?()
A.白炽灯
B.荧光灯
参考答案:B
你知道扛枪上战场的机器人SWORDS的前身是什么吗?()
A、侦查机器人
B、月球车
C、排爆机器人
The () of social security benefits often feel that they are contributing more than they in fact receive in terms of medical care, pensions, etC.
A.receipts
B.receivers
C.recipients
D.payees