下面不属于书面合同的是()。
A、表格合同
B、保险单
C、定式合同
D、合同确认书
参考答案:B
速度为1m/s的乘客电梯应设置()形式的安全钳
A.瞬时式
B.渐进式
C.多个瞬时式
D.瞬时渐进式
In order to ensure that a RACON signal is displayed on the radar,you should().
A.increase the brilliance of the PPI scope
B.turn off the interference controls on the radar
C.use the maximum available range setting
D.increase the radar signal output