【简答题】常用的三种标准缓冲溶液的pH值(精确到小数点后两位)分别是4.00、(__)、9.18
【单选题】短文 (录音中题号No. 16)
A.
Because he took a two-week course.
B.
Because he wanted to show his strong creativity.
C.
Because he didn’t have enough money to buy it.
D.
Because he loved to make furniture.
【简答题】RLC并联电路如图所示。已知电流表A1的读数为3A,A2的读数为8A,A3的读数为4A,求电流表A的读数。I=( )A。【图片】
【单选题】电路如图所示, A1的读数为3A, A2的读数为4A, 则电流表A的读数为 A。
【单选题】电路如图所示,A1的读数为2A, A2的读数为 5A, 则电流表A的读数为 A