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【判断题】
折射球面的光焦度 ,表征折射面偏折光线的能力A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】— When is your first class? —It’s at 8:20 am. [ ]
A.
What’s the time
B.
What time
C.
Where
D.
Why
【单选题】—________ today? —It's September third. [ ]
A.
What day is
B.
When is
C.
What's the date
D.
What time is
【单选题】---- ______does the meeting begin? ---- ______8:30. [ ]
A.
What's time;At
B.
When;In
C.
What time;On
D.
When;At
【单选题】—_____? —It's eight-thirty. [ ]
A.
What day is it
B.
What's the date
C.
What time is it
D.
When is your birthday
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