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【单选题】
视场角为多少度的镜头属于标准镜头?A.
80度以上
B.
70度—95度
C.
90度
D.
40度—60度
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反馈参考答案：
举一反三
【简答题】交流电机按转速是否变化分为
【单选题】We can connect two inductors L1 and L2 in series to get a larger inductor. Compare the total inductance L with L1 + L2, which statement is true?
A.
L > L 1 + L 2
B.
L = L 1 + L 2
C.
L < L 1 + L 2
D.
All the 3 results are possible
【多选题】In ACT 3, Philip says, "What a day!" What does it mean?
A.
That person had a really good day.
B.
That person had a busy day.
C.
That person had a bad day.
D.
This expression doesn't mean anything.
【简答题】inductance
【简答题】For fig a, the equivalent inductance is ( )mh For fig b, the equivalent inductance is ( )μh
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