设z=excosy，则等于（） A．excosy B．-excosy C．exsin

根据《中华人民共和国海关法》和《中华人民共和国进出口关税条例》的规定，当事人(纳税义务人)对海关确定的进出口货物的征税、减免税、关税退补持有异议时，应先按海关核定的税额缴纳关税，然后再向原核定海关、海关总署申请复议，直至向人民法院起诉。( )

     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

简述医疗保险的特征？

带式输送机所使用的输送带有橡胶带和塑料带两种，其中橡胶带适用于工作环境温度（）之间。

A.15—40°

B.-15—40°

C.-20—40°

D.20—40°

减速器油量要适当，油面应超过大齿轮半径的（）。

A.1/2

B.1/3

C.2/3

D.1/4