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【单选题】
一台变压器原线圈输入380V电压后，副线圈输出电压为19V，若副线圈增加150匝，输出电压增加到38V，则变压器原线圈的匝数为（ ）A.
3000 匝
B.
500 匝
C.
600 匝
D.
2000 匝
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反馈参考答案：
举一反三
【简答题】用钢楔劈物，接触面间摩擦角为φm，钢楔重力不计。劈入后欲使楔不滑出，钢楔两个平面的夹角α(如图所示)应为()。
【单选题】How do the students demonstrate that they really enjoy professor Hawl's classes?
A.
They complete all their assignments.
B.
They study hard for his tests.
C.
They compete for the best seats in the class.
D.
They read all his books.
【简答题】vt. 迫使,强迫 首字母c ________ sb to do sth
【单选题】I really enjoy the noodles and vegetables. They delicious.
A.
stay
B.
feel
C.
taste
D.
sound
【单选题】-----Do you regret having quit your job? ----Why should I? I ________ as much ,but I really enjoy the present one.
A.
didn’t earn
B.
don’t earn
C.
hadn’t earned
D.
haven’t earned
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