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【判断题】
钙具有抗腐蚀性能。
A.
正确
B.
错误
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【简答题】After the match all the players became (relax). 2. The number of teachers in this school (be) a1. After the match all the players became (relax). 2. The number of teachers in this school (be) about ...
【单选题】婴幼儿血维生素A水平低于多少g/L即构成维生素A缺乏症()
A.
100
B.
200
C.
300
D.
400
E.
500
【单选题】流脑病人脑脊液必须立即送检的原因是
A.
细菌为专性厌氧菌
B.
细菌离开人体后得不到营养
C.
细菌不能在空气中暴露
D.
细菌对寒冷、干燥极敏感,易死亡后溶解
E.
标本搁置过久容易污染
【单选题】流脑病人脑脊液必须立即送检的原因是
A.
离开人体后得不到营养
B.
专性厌氧,不能在空气中暴露
C.
对寒冷、干燥极敏感,易死亡
D.
标本搁置过久容易污染
E.
以上均不是
【单选题】下列说法正确的是( )
A.
连续函数必能取到最值
B.
闭区间上的连续函数只能在区间端点取到最值
C.
若闭区间上的连续函数在两端点处函数值异号,则该函数曲线至少穿过X轴一次
D.
复合函数在其定义区间内不一定连续
【单选题】From Paragraph 5 we can learn that ______.
A.
the number of segregated smokers is on the rise
B.
the number of male smokers is decreasing gradually
C.
the number of female smokers is increasing now
D.
the number of nonsmokers is larger than that of smokers
【简答题】Listen to news report 1 again and fill in the blanks with numbers. a. The number of students taught about the advantages of a vegan diet: (1) from(2) schools. b. The number of students offered the ch...
【简答题】Questions 1-3 Choose the correct letter, A, B or C. 1. How many people die from hunger each year? A. More than 9 million people. B. More than 6 million people. C. More than 5 million people. 2. What d...
【判断题】在闭区间内,函数的最值只能在区间端点处取得
A.
正确
B.
错误
【单选题】There _____ a great number of students over there. The number of the students ____ five thousand.
A.
are, is
B.
are, are
C.
is, are
D.
is, is
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