棉纤维在较小拉伸外力长时间作用或多次拉伸的情况下,即使外力比纤维的断裂负荷小得多,纤维也会产生()而导致破坏。P58
A.拉伸
B.摩擦
C.磨损
D.疲劳
参考答案:D
完成对话,将句子的序号填入空白处:(5分)
Kitty: Hi, Daniel! 1 .Shall we go to the Summer Palace?
Daniel: I'm afraid that's not a good idea. 2
Kitty: 3
Daniel: That sounds great. 4 .
I'd like to go to the World Park.
Kitty: Sure. 5
Daniel: At 8:00 at the school gate.
Kitty: OK. See you then.
患者右下肢无力3个月,左下半身麻木,检查左 * * 水平以下痛温觉减退,右膝腱反射亢进,右侧Babinski(+),右髌前上棘一下音叉振动觉减退,右足趾位置觉减退,病变为:()
A.T4水平横贯性损害
B.右侧T4水平半侧损害
C.左侧T4水平半侧损害
D.右侧T4水平后索损害
E.左侧T4水平后索损害