现金清查时，出纳人员必须在场。 （ ）
参考答案：对
某电阻容许通过的电流是2安，把它接在电压U1为24伏的电路中，通过它的电流I1=0.6安，试求它的电阻．它能否接在电压U2为110伏的电源上？
The team’s efforts to score were ______ by the opposing goalkeeper.
A. frustrated B. prevented C. discouraged D. accomplished
