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【多选题】
下列有关谷氨酸棒状杆菌的生长和谷氨酸发酵的叙述,正确的是( )。
A.
组成酶是维持菌体基本生活的必要条件
B.
菌体能合成各种生长因子,无需从外界补充
C.
发酵液 pH 呈酸性时,不会生成乙酰谷氨酰胺
D.
细胞膜透性的改变可解除代谢产物对酶活性的抑制
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举一反三
【单选题】Look at the following writing question and choose which essay structure is incorrect . Some people think that governments should spend money on railways. Others believe that there should be more inves...
A.
(1) introduction; (2) body paragraph 1; (3) body paragraph 2; (4) conclusion
B.
(1) introduction; (2) body paragraph; (3) conclusion
C.
(1) introduction; (2) body paragraph 1; (3) body paragraph 2; (4) body paragraph 3; (5) conclusion
【简答题】已知函数f(x)=x 2 +(a+1)x+lg|a+2|(a∈R,且a≠-2). (Ⅰ)若f(x)能表示成一个奇函数g(x)和一个偶函数h(x)的和,求g(x)和h(x)的解析式; (Ⅱ)命题P:函数f(x)在区间[(a+1) 2 ,+∞) 上是增函数; 命题Q:函数g(x)是减函数.如果命题P、Q有且仅有一个是真命题,求a的取值范围; (Ⅲ)在(Ⅱ)的条件下,比较f(1)和 1 6 的大小.
【简答题】已知函数f(x)=x 2 +(a+1)x+lg|a+2|(a∈R,且a≠-2). (1)写出一个奇函数g(x)和一个偶函数h(x),使f(x)=g(x)+h(x); (2)对(1)中的g(x).命题P:函数f(x)在区间[(a+1) 2 ,+∞)上是增函数;命题Q:函数g(x)是减函数;如果命题P、Q有且仅有一个是真命题,求a的取值范围; (3)在(2)的条件下,求f(2)的取值范围.
【简答题】短文填词。 (1)O Sundays, we like (2)g to the movies. My (3)f movies are (4)t . Some people think they're scary but I like (5)t very much. I don't like (6)d because they are boring. But some people like the...
【简答题】设a∈R,f(x)为奇函数,且 f(2x)= a? 4 x - a -2 4 x +1 (1)试求f(x)的反函数f -1 (x)的解析式及f -1 (x)的定义域; (2)设 g(x)=lo g 2 1+x k ,是否存在实数k,使得对于任意的 x∈[ 1 2 , 2 3 ] ,f -1 (x)≤g(x)恒成立,如果存在,求实数k的取值范围.如果不存在,请说明理由.
【单选题】Everybody dreams. Some people think dreams can tell us about the future. Other people think dreams tell us about ourselves. It ’ s like our 1 is talking to us. Why are dreams 2 strange and hard ...
A.
body
B.
spirit
C.
brain
D.
heart
【简答题】已知函数 f(x)=lo g a 1-x 1+x (0<a<1) . (1)求函数f(x)的定义域D,并判断f(x)的奇偶性; (2)如果当x∈(t,a)时,f(x)的值域是(-∞,1),求a与t的值; (3)对任意的x 1 ,x 2 ∈D,是否存在x 3 ∈D,使得f(x 1 )+f(x 2 )=f(x 3 ),若存在,求出x 3 ;若不存在,请说明理由.
【简答题】已知函数f(x)=x 2 +(a+1)x+lg|a+2|(a∈R,且a≠-2) (I)若f(x)能表示成一个奇函数g(x)和一个偶函数h(x)的和,求g(x)和h(x)的解析式; (II)命题P:函数f(x)在区间[(a+1) 2 ,+∞)上是增函数;命题Q:函数g(x)是减函数.如果命题P、Q有且仅有一个是真命题,求a的取值范围; (III)在(II)的条件下,比较f(2)与3-lg2的大小.
【简答题】Everybody dreams. Some people think dreams can tell us about the future. Other people think dreams tell us about ourselves. It's like our 1 is talking to us. Why are dreams often strange and hard to u...
【简答题】Everybody dreams. Some people think dreams can tell us about the future. Other people think dreams tell us about ourselves. It’s like our 1 is talking to us. Why are dreams 2 strange and hard to...
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