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【单选题】
下列关于霍乱弧菌的特点,错误的是A.
革兰阴性,弯曲成弧状
B.
耐碱不耐酸
C.
含有H和O抗原
D.
具有鞭毛,运动活泼
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反馈参考答案：
举一反三
【单选题】Which of the following statements about the matrix experiment is true?
A.
The subjects have to be highly intelligent to solve the matrices.
B.
A research assistant helps to count the correct answers.
C.
The subjects are paid according to how fast they solve the matrices.
D.
The researcher designed a variety of conditions for the matrix test.
【多选题】Let A be a singular nxn matrix, which of the following statements are true?
A.
det(A)=0.
B.
adj A is singular.
C.
Ax=b has infinitely many solution.
D.
for every nxn matrix B, AB is singular.
E.
A can be written by product of some element matrices.
【单选题】We usually fold a letter in thirds , and is more common.
A.
z-fold
B.
tri-fold
C.
None of the above
【单选题】Which type of pocket square fold is less suited for formal attire?
A.
Presidential fold
B.
One-tip-up fold
C.
Two-tips-up fold
D.
Crown fold
E.
Puff fold
【简答题】A．hole B．none C．old D．fold
【简答题】中药炮制经历了哪四个时期:
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