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【单选题】
造成滑行的原因之一是闸瓦压力过高,使制动力大于( )。造成滑行的原因之一是闸瓦压力过高,使制动力大于( )。
A.
摩擦力
B.
粘着牵引力
C.
轮轨间的粘着力
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【单选题】下列哪种物质是体内硫酸基的提供者
A.
ATP
B.
NADP +
C.
PAPS
D.
Met
E.
GMP
【单选题】被霍乱弧菌污染的食具最佳的消毒措施是( )
A.
紫外线
B.
煮沸
C.
2%含氯石灰
D.
乙醇
E.
3%的苯酚
【单选题】听力原文: Harvard President Lawrence Summers announced a plan today to improve conditions for female scientists at the university. Summers said Harvard would spend fry million dollars over the next ten ye...
A.
Women may not have the aptitude for science and mathematics that men have.
B.
A plan to improve conditions for scientists.
C.
A plan to improve the conditions of the university.
D.
A plan to improve conditions for female scientists.
【简答题】As a kid, I spent my summers with my grandparents in Texas. And every few summers, we’d __16__ the caravan (旅游团队), a group of Airstream trailer owners who __17__ together around the U.S. and Canada. I...
【单选题】“The long summers of forgetting take a toll ”in the last paragraph but one means that
A.
long summer vacation slows down the progress go learning.
B.
long summer vacation has been abandoned in Europe.
C.
long summers result in less learning time.
D.
long summers are a result of tradition.
【简答题】在下图所示电路中,二极管性能理想,试判断电路中的二极管是导通还是截止,并求出 A 、 B 两点之间的电压 U AB 值。
【单选题】'The long summers of forgetting take a toll' in the last paragraph but one means that ______.
A.
long summer vacation slows down the progress of learning
B.
long summer vacation has been abandoned in Europe
C.
long summers result in less learning time
D.
long summers are a result of tradition
【简答题】根据材料一、二、三,完成各题(14分) 材料一 黄河三角洲略图和珠江三角洲略图 材料二 珠江三角洲是我国重要的工业基地。近年来,该地一部分劳动力指向型和原料指向型企业向省内的边远地区转移,并在本省边远地区产生集群效应。 材料三 继日本三大汽车企业本田、丰田、日产分别落户广州黄浦、番高、花都区后,近几年来珠江三角洲地区汽配产业迅速发展。珠江三角洲地区成为全国三大汽车产业基地之一。 (1)近年来,由于...
【单选题】下列是体内硫酸基提供者的是()
A.
ATP
B.
NADP+
C.
PAPS
D.
PAD
E.
GMP
【单选题】下列哪种物质是体内硫酸基的提供者
A.
ATP
B.
NADP+
C.
PAPS
D.
PAD
E.
GMP
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