关于肠道病毒，正确的是
A．RNA病毒B．临床表现局限于肠道C．抵抗力较弱D．包膜病毒E．无中枢神经系统病变
参考答案：A
--- It is selfless _____ the doctor to devote all the time he had for the patients.
--- I think so, they are so great.
A．for; to care
B．of; to care
C．for; to caring
D．of; to caring
过电压、欠电压或超负荷装置脱扣后，双燃料发电机就没有（）。
