假性胰腺囊肿小于()cm可不考虑手术治疗
A.15
B.12
C.9
D.6
E.3
参考答案:D
Computers of this kind __________. They are out of stock (脱销) now.
A.sell good
B.sell well
C.are sold good
D.are sold well
具有升华性的生物碱是()
A.喜树碱
B.蛇根碱
C.咖啡因
D.长春碱
E.毒芹碱