用于防止过载的溢流阀又称安全阀,其阀口始终是开启的。

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问题:

用于防止过载的溢流阀又称安全阀,其阀口始终是开启的。

考点:维修电工考试维修电工考试题库
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修井机的技术参数主要取决于动力设备的()、零部件材料的性能、加工制造、设计方法等四大因素.

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甘草皂苷元是

A.甘草酸

B.甘草次酸

C.熊果酸

D.齐墩果酸

E.以上均非

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电影票原价若干元,现在每张降价3元出售,观众增加了一半,收入也增加了1/5,一张电影票原来多少元?

A.4.5元

B.7.5元

C.12元

D.15元

题型:判断题

     In America, drivers' education is part of the regular high school curriculum (课程). Every student in

his or her second year of high school is required to take a class in driver's education. However, unlike

other courses, it is not given during the regular school year. Instead it is a summer course.

     The course is divided up into two parts: class time for learning laws and regulations, and driving time

to practice driving. Class time is not unlike any other class. The students study the basic traffic laws from

a text to pass the written driving test that is given to anyone who wants to get a driver's license.

     Driving time is a chance for the students to get behind the wheel and practice starting steering, backing up, parking, switching lanes, turning corners, and all the other maneuvers  (操作) required to drive a car.

Each student is required to drive a total of six hours. The students are divided up into groups of four. The

students and the instructor go out driving for two hour blocks of time. Thus, each student gets half an hour driving time per outing. The instructor and "driver" sit in the front seats and the other three students sit in

the back.

     After the student has passed the driver's education course and reached the appropriate age to drive

(this age differs in every state but in most cases the person must be 16 years old),they can go to a

designated (指定的) state office to take their driver's test, which is made up of an eye examination, a

written test, and a road test. The person must pass all three tests in order to be given a driver's license.

If the person did well in his or her driver's education class, he or she will pass the test with flying colors

and get a driver's license.

1. We can infer that the students are required to ____ in their whole driving practice.

A. spend at least six hours driving      

B. get half an hour driving

C. drive for two hour blocks of time      

D. go out driving for twelve times

2. Which of the following is Not True for the students wanting to get their driver's license?

A. They must have their eyes examined.

B. They must be 16 years of age.

C. They should go to have their driver's test.

D. They ought to do well in their driver's course.

3. In the last sentence, "with flying colors" means______.    

A. happily    

B. quickly    

C. colorfully    

D. successfully

题型:判断题

数据压缩编码方法可以分为无损压缩和有损压缩,其中 (1) 属于无损压缩。无损压缩编码的特点是 (2)

2()

A.无失真恢复数据、压缩比低

B.无失真恢复数据、压缩比高

C.有失真恢复数据、压缩比低

D.有失真恢复数据、压缩比高

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