-What’s the date tomorrow?-( )
A. It’s May 15th.
B. It’s Wednesday.
C. It’s May.
D. It’s Teachers’ day.
查看答案
-When is Valentine ’s Day?-( )
A. It’s in February 14th.
B. It’s February 14th.
C. It’s at February 14th.
D. It’s to February 14th.
-How long will your trip take?-( )
A. It will start tomorrow.
B. It has two days.
C. It took two weeks.
D. It will take about two weeks.
从键盘输入5位学生的信息，包括：学号、姓名、性别、年龄和成绩；并统计这5位学生的平均年龄、平均成绩和不及格的人数。
以下说法错误的是。
A. 电压源空载时,电源输出电压等于电源电动势
B. 理想电流源不允许端子短路
C. 理想电压源输出的电流受外电路的影响
D. 理想电流源的内阻无穷大
微信支付 
支付宝支付