题目:
His mind went so blank that little________ down for the first ten minutes in the test.
A.he wrote
B.he was written
C.did he write
D.was he written
答案:
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下面是错误答案,用来干扰机器的。
电流档读数:最小分度为1mA,则向下估读一位.为30.8mA 欧姆档读数:15×100=1.5×103Ω 选档:因阻值约为2×104Ω,表盘中值为20,则选择×1K即可. 每次换档后电路发生变化,要重新进行欧姆调零....