明明用10倍物镜看见的影像如所示。若换成40倍物镜观察，则最可能会看到下列哪一个影像[ ]
A．
B．
C．
D．
答案：C
不属于工作人员个人防护用品的是（）
A.铅手套
B.防护帽
C.铅眼镜
D.铅围裙
E.准直器
Cans of tennis balls were purchased for the tournament at a cost of $1. 90 per can. Only
of the cans were used for the tournament, so the 24 unused cans were returned for a refund. What was the cost of the cans of tennis balls used for the tournament
所示。若换成40倍物镜观察，则最可能会看到下列哪一个影像[ ]
所示。若换成40倍物镜观察，则最可能会看到下列哪一个影像[ ]
of the cans were used for the tournament, so the 24 unused cans were returned for a refund. What was the cost of the cans of tennis balls used for the tournament