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警冲标应设在两会合线路线间距离为()m的中间,有曲线时按限界加宽办法加宽。
常用的写意山水画技法有()。
A. “勾”“皴”“染”“描”
B. “勾”“皴”“染”“点”
C. 勾线、罩染、涂色
D. 写生、勾线、染色
When using the radar for navigating().
A. the best fix is obtained by using a tangent bearing and a range
B. and using two radar ranges for a fix,the objects of the ranges should be close to reciprocal bearings
C. and using ranges,the most rapidly changing range should be measured last
D. and crossing a radar range of one object with the visual bearing of a second object,the two objects should be 80°to 110°apart