组装检波器芯体时应先装（）才能执行下一道工序。
A、线圈
B、弹簧片
C、磁钢
D、垫圈
参考答案：C
It has been proved _____ eating vegetables in childhood helps to protect you against serious illnesses
in later life. [ ]
A. if
B. because
C. when
D. that
银行在日常经营中因各种人为的失误、欺诈及自然灾害、意外事故引起的风险是 ( )。
A．操作风险B．市场风险C．利率风险D．国家风险
