He plans ____ a very relaxing vacation. [ ]
A. to have
B. having
C. to having
答案:A
治疗支原体肺炎首选的抗生素是()
A.青霉素
B.妥布霉素
C.氨苄西林(氨苄青霉素)
D.红霉素
E.链霉素
倾斜牙作固定桥基牙的最大倾斜度不应超过
A.5°B.30°C.45°D.90°E.135°