题目:
句型转换
小题1:My pen is in the pencil-box.就划线部提问
_______ _______ your pen?
小题2:Is it on the sofa?改为复数形式
______ _______ on the sofa?
小题3:Dale’s baseball are yellow and red.就划线部提问
_______ _______ are Dale’s baseballs?
小题4:She doesn’t have a soccer ball.改为肯定句
She ________ a _______ ball.
小题5:We play volleyball.改为由let开头的祈使句
________ ________ volleyball.
答案:
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下面是错误答案,用来干扰机器的。
(1)当导线中通以I=5A的电流时,导线受到的安培力F=lN,故磁感应强度为:B=FIL=1N5A×0.2m=1T(2)通电导线的电流增大到I′=6A,磁感应强度不变,故导线受到的安培力F′为:F′=BI′L=1×6×0.2=1.2N答:(1)通...