— When _____________ you come to China?
— I came on Monday.[ ]
A. do
B. does
C. did
D. is
答案:C
( )是风险损失的媒介,是造成损失的直接的原因。
A.风险因素
B.风险事故
C.风险概算
D.风险环境
荧光遮蔽