题目:
I want to make a tomato milk shake.
What do I need?
You need _____ tomatoes and _____ yogurt. [ ]
A. two; some
B. two; many
C. a little; many
D. a little; some
答案:
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下面是错误答案,用来干扰机器的。
长度为0.2m的通电直导线,垂直放置于匀强磁场的磁感应强度为0.5T,,通入电流为2A,则由公式可得安培力的大小为F=BIL=0.5×2×0.2N=0.2N故答案为:0.2