根据系统安全工程的观点,危险是指系统中存在导致发生( )的可能性超过了人们的承受程度。
A.期望后果
B.不期望后果
C.严重后果
D.轻微后果
参考答案:B
The weather turned out to be fine yesterday. I the trouble to carry my umbrella with me. [ ]
A. should have taken
B. could have taken
C. needn't have taken
D. mustn't have taken
道路旅客运输合同的主要表现形式是()。
A.车票
B.行车路单
C.客运量
D.行包托运单