甲硝唑对肠内、肠外阿米巴滋养体均有强大的杀灭作用。
参考答案：对
已知电阻R1=12Ω，R2=60Ω，并连接在电压U=6V的电源上，其总电阻R为_________ Ω，干路总电流I为 _________ A
——Can I pay the bill by check?
——Sorry, sir. But it is the management rule of our hotel that payment ____ be made in cash.
A．shall
B．need
C．will
D．can
