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【单选题】
以下选项中关于正弦交流电说法正确的是A.
有效值是指正弦交流电所能达到的最大值
B.
角频率是指正弦交流电每秒改变电流或电压方向的次数
C.
初相位是指t=0时刻正弦交流电所处的相位角
D.
频率是指正弦交流电变化一次所需要的时间
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反馈参考答案：
举一反三
【单选题】int a[ ]={45, 4 , 67, 23, 657, 787, 34, 52, 56};数组中a[5]的值为( )。
A.
45
B.
23
C.
787
D.
657
【简答题】healthy energy weight spend born Corn, vegetables and fruits, which are ________ food, are good choices for daily meals.
【单选题】Corn, vegetables and fruits, which are ________food, are good choices for daily meals.
A.
oily
B.
healthy
C.
unhealthy
D.
harmful
【判断题】Both corn, vegetables, fruits, hamburgers and ice-cream are good choices for daily meals.
A.
正确
B.
错误
【简答题】Fill in the blanks with the proper forms of the words given below. healthy ; energy ;weight ;amount ; measure ; calories ;make sb. do sth ; instead of ; need sb. to do sth ; spend ......
【简答题】healthy energy weight amounts spend special independent absorbed started born 3.Corn, vegetables and fruits, which are ________ food, are good choices for daily meals.
【单选题】int a[]={45, 4 , 67, 23, 657, 787, 34, 52, 56};数组中a[5]的值为( )
A.
23
B.
45
C.
657
D.
787
【简答题】翻译下列段落 To keep healthy weight, it is important to have the right amount of calories for your age. The calorie is the measure of how much energy food gives us. Doctor King says boys and girls need diff...
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