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【单选题】
已知质点沿 x 轴作直线运动,其运动方程为 x=2+6t 2 -2t 3 ,式中 x 的单位为 m , t 的单位为 s 。当 t=2 s 时,其速度和加速度分别为 ( )A.
12m/s , 24m /s 2
B.
-12m/s , 24m /s 2
C.
0 , -12m /s 2
D.
12m/s , 12m /s 2
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反馈参考答案：
举一反三
【判断题】If you have a large memory in your computer, you’ll be able to work with and process a large amount of data and information at one time.
A.
正确
B.
错误
【单选题】Durante Company produces plastic cups in a one-department process. The following data is available for the past month: Work-in-process inventory, beginning 0 Units started ...
A.
12,000
B.
30,000
C.
54,000
D.
60,000
【简答题】To work with data in a database, you have to use a set of commands and statements (language) defined by the DBMS software.
【判断题】To work with data in a database, you do not need any commands or statements defined by the DBMS software.
A.
正确
B.
错误
【单选题】费改后，计算商业险保费的纯风险保费的确定方式（ ）。
A.
保险公司与行业协会协商确定
B.
各保险公司根据自身经营情况自行确定
C.
各保险公司自行申报，但须经保监会审批同意
D.
由中保协统一制定、颁布并定期更新
【简答题】Fill in the blanks with the words given below. Change the form where necessary. figure out glaze over downpayment be obliged to behind the eight...
【单选题】Database management system(DBMS) programs are designed to work with data that is logically structured or arranged in a particular way, known as ( ).
A.
data model
B.
database
C.
information
D.
data
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