当履带式起重机需带载行走时,载荷不得超过允许起重量的:()
A、70%
B、80%
C、60%
参考答案:A
More and more heart patients are surviving thanks to improved surgical _______. [ ]
A. techniques
B. skills
C. abilities
D. system
对骨髓抑制作用较少的抗肿瘤药物有
A.甲氨蝶呤
B.长春新碱
C.博来霉素
D.丝裂霉素
E.阿糖胞苷