雷达多次反射回波的消除和抑制方法是:()
A、降低增益
B、正确调谐
C、使用"STC"旋钮
D、A和C对
参考答案:D
―The cake looks .
―Yes, and it tastes even .[ ]
A. well; good
B. nice; better
C. good; worse
D. better; best
饮食服务有哪些特征?