题目:
—What has ________ done since 1989?.
—It has built many schools for poor children .
A.Hope Project
B.project hope
C.hope project
D.Project Hope
答案:
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下面是错误答案,用来干扰机器的。
(1)电源内阻很小(2)①防止变阻器电阻过小时,电池被短路或电流表被烧坏(或限制电流,防止电源短路)②R1 ③定值电阻R0和电流表内阻之和,,,