题目

如图8所示，滑动变阻器的滑片P向B滑动时，电流表的示数将___；电压表的示数将_____。（填“变大”、“变小”或“不变”）如此时电压表的示数为2．5V，要使电压表的示数变为3V，滑片P应向_______端滑动。  答案：变小  变小  A或左解析:略 The 29th Olympics Games _____ in Beijing in 2008. A. is held B. was held C. will be held D. has been held