皮皮学，免费搜题
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搜题
【单选题】
留取24小时尿标本时,标本中加甲醛的作用是:A.
尿液中的激素被氧化
B.
固定尿中有机成分
C.
防止细菌污染
D.
保持尿液中的化学成分不变
E.
延缓尿液中化学成分的分解
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举一反三
【单选题】I gave his book to read, but after a page or two he would put _______book down and pick up _________new one．
A.
a; the
B.
the; 不填
C.
the; a
D.
a; a
【单选题】Please _____, Tom! It's your book. [ ]
A.
pick it up
B.
pick up it
C.
pick up them
D.
pick them up
【单选题】U407 What is the advantage of marking up a book according to the speaker?
A.
Marking up a book helps readers take in the brilliant ideas in the book.
B.
Marking up a book enables readers to know what they read.
C.
Marking up a book makes readers feel like the owner of the book.
D.
Marking up a book makes readers conscious of the fact that they are reading actively.
【简答题】If you are interested in this line ______ thinking, please r ead this book for more details.
【单选题】What is the advantage of marking up a book according to the speaker?
A.
Marking up a book helps readers take in the brilliant ideas in the book.
B.
Marking up a book enables readers to know what they read.
C.
Marking up a book makes readers feel like the owner of the book .
D.
Marking up a book makes readers conscious of the fact that they are reading actively.
【单选题】关于电场强度和电势的关系,下列说法正确的是
A.
场强相等的区域，电势也处处相等
B.
场强为零处，电势也一定为零
C.
电场强度较大处，电势不一定高
D.
电势较高处, 电场强度一定较大
【单选题】关于电场强度和电势的关系,下列说法正确的是:
A.
某点电场强度的方向一定是该点电势梯度的负方向；
B.
某点电场强度的方向一定是该点电势梯度的正方向；
C.
电场强度为零处，电势一定为零；
D.
电势为零处，电场强度一定为零。
【简答题】Gang up Bulk cargo Book
【单选题】关于电场强度和电势的关系, 下列说法中正确的是
A.
电势不变的空间, 电场强度一定为零
B.
电势不变的空间, 电场强度不为零
C.
电势为零处, 电场强度一定为零
D.
电场强度为零处, 电势一定为零
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