下面的句子不成对偶，请改动下句，使它们组成一组对偶句。(2分) 上句：看社会知国

超声探头的维护和保养措施，错误的是（）。

A.避免探头撞击、落地

B.用乙醇擦拭清洁探头

C.不可采用高温蒸煮消毒探头

D.避免用力牵拉、扭曲探头电缆线

E.禁用液状石蜡做耦合剂

根据短文内容，判断下列句子的正(T)误(F)。

        Most people in the United States like fast food, but if you think that American people don't like cooking,

you are wrong. It's true that most Americans eat fast food for their breakfast and lunch, but they also think

cooking is interesting. Parents see the importance of teaching their children how to cook, and most Americans

say that home-cooked meals are the best. 

       Americans have their own way of cooking. For example, baking is the most popular way of cooking in

America. Most American families have ovens. American cooks care about the balance of diet. When planning a

big meal, they try to cook meat, a few vegetables, some bread and sweet food. They also like to make the meal

looks beautiful. There are so many kinds of colorful foods, so the meal is healthy and looks beautiful, too.

( ) 1. Most Americans like fast food and don't like cooking at all.

( ) 2. Most Americans have fast food for their breakfast and lunch.

(     ) 3. Frying is the most popular way of cooking in the USA.

( ) 4. To eat a balanced diet, Americans cook meat, vegetables, bread and sweet food for a big meal.

(     ) 5. The meal looks beautiful because the foods are in different colors.

万宝路香烟

制定质量方针和质量目标的目的和意义？

平行光管在精密机床制造中，主要用来和（）相配合，组成光学系统。

A.经纬仪

B.水平仪

C.比较仪