内部过电压又分为()、()和()三类。
参考答案:操作过电压、工频过电压、谐振过电压
Many students signed up for the _______ race in the sports meeting.
A.400-meter-long
B.400-meters-long
C.400 meter long
D.400 meters long
下列各项中,能使通气/血流比值升高的是
A.肺水肿
B.肺气肿
C.肺纤维化
D.肺毛细血管阻塞