根据美国CDC推荐,妊娠和(或)哺乳期的性病性淋巴肉芽肿患者的治疗首选()。
A.红霉素
B.四环素
C.多西环素
D.阿奇霉素
E.氧氟沙星
参考答案:A
—I need to _____ English well if I want to be a flight attendant .
—But I think Mr. Smith can _____ you some easy ways to improve your English better and faster. [ ]
A. speak; tell
B. speak; say
C. say; tell
D. say; talk to
介质受潮后会使击穿电压()。
A.下降
B.上升
C.不变
D.无规律