题目内容

公路景观环境保护对策有哪些？

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横向力系数是（）

A. 横向力与法向反力的比值
B. 法向反力与横向力的比值
C. 横向力与汽车重量的比值
D. 法向反力与汽车自重的比值

当公路的设计车速为60km/h时，反向曲线间的直线段最小长度以不小于（）为宜。

A. 80m
B. 120m
C. .360m
D. 480m

The PFD is designed to improve a pilot's situational awareness by integrating this information into a ______display instead of six different analog instruments.

A. only
B. individual
C. single
D. unique

PFDs also increase situational awareness by alerting the aircrew to unusual or potentially_____conditions (e.g., low airspeed, high rate of descent) by changing the color or shape of the display or by providing audio alerts.

A. bad
B. harmful
C. beneficial
D. hazardous