Radar is not only to obtain（）,but also to measure their distance away from you.

（）is not a job of the radar antenna.

Not only she but also her neighbours ______to the party.

is an important one, but not the only web data formats.

练习15　　(1) Whatever its underlying reason, there is no doubt that much of the pollution caused could be controlled if only companies, individuals and governments would make more efforts. In the home there is an obvious need to control litter and waste. Food comes wrapped up three or four times in packages that all have to be disposed of; drinks are increasingly sold in bottles or tins which cannot be reused. (2) This not only causes a litter problem, but also is a great process by persuading many of us not only to buy things we neither want nor need, but also to throw away much of what we do buy. Pollution and waste combine to a problem everyone can help to solve by cutting out necessary buying, excess consumption and careless disposal of the products we use in our daily lives.

（）is not used in modern radar.

is a category assigned to products or services having the same fimctional use but different technical characteristics. It is not same as quality.

is a category assigned to products or services having the same functional use but different technical characteristics. It is not same as quality.

（ ） is a category assigned to products or services having the same functional use but different technical characteristics. It is not same as quality.

A position obtained by applying ONLY your vessel’s course and speed to a known position is a （）.

Radar is used to not only to look（）,but also to measure their distances away from you.

In dense fog a vessel without operational radar may not be justified（）at all but should anchor if it is safe and practicable for her to do so.