不是宫颈癌高剂量率后装治疗的要点的是()
A.治疗时间短
B.放射容器移位小
C.医护人员防护好
D.有利于乏氧细胞再氧合
E.有利于医师操作
参考答案:D
Recently quite a lot of exports _______ that another law on wildlife protection ________ as soon as possible .
A.demanded , must be passed
B.have demanded, be passed
C.were demanding , was passed
D.demanded, being passed
A.乙醇和浓硫酸共热140℃可获得大量的乙烯
B.乙烯能发生加成、加聚、氧化反应
C.能用酸性KMnO4溶液来鉴别乙烯和苯
D.乙烯是一种植物生长调节剂,可用以催熟果实