常规分割照射时,脊髓的耐受量是()。
A.3500cGy
B.4000cGy
C.4500cGy
D.5000cGy
E.5500cGy
参考答案:C
—What's the girl doing ?
—She is _____ her bike, but she can't _____ it . [ ]
A. looking for; find
B. finding; looking for
C. seeing; find
D. looking ; find
不属于低合金高强度结构钢特性的是()。
A.材质均匀、性能可靠
B.较强的耐腐蚀性能
C.有高的强度和较好的塑性、韧性,可承受各种性质的荷载
D.具有优良的可加工性,可焊、可铆,可制成各种形状的型材和零件