彩色电视信号的色—亮时延差过大时，其图像表现为（）。
A.图像暗，负象
B.网状干扰，噪声大
C.镶边，拖尾
参考答案：C
水稻生长的后期，为防止灌溉后倒伏，应多施[ ]
A．含钾的无机盐
B．含磷的无机盐
C．含氮的无机盐
D．含锌的无机盐
After that, he knew he could ______ any emergency by doing what he could to the best of his ability.
A．get away with
B．get on with
C．get through
D．get across
