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【简答题】
铸件典型宏观凝固组织是由哪几部分构成的，它们的形成机理如何？
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反馈参考答案：
举一反三
【单选题】听力原文： Good morning. I' d like to welcome you to your first yoga class. Before we begin our exercises, it is important that we undid a few facts about yoga. First of all, it is not a religion. Yoga is ...
A.
a delicate art
B.
a religion
C.
an exact science
D.
a way of life
【简答题】设数列{a n }是公比为q＞0的等比数列，S n 是它的前n项和，若 ，则此数列的首项a 1 的取值范围为（ ）．
【单选题】听力原文：M: We'll go for an outing tomorrow. Would you like to join us? W: I' d like to, but I think it' s going to rain. The temperature is dropping. M: You can' t be right. The weather forecast says fin...
A.
Because she is afraid of bad weather.
B.
Because the temperature is too low.
C.
Because the weather forecast predicts bad weather.
D.
Because outings are risky.
【单选题】FAQ: I have an idea I' d like to submit to TEC. How can I do that? We appreciate your interest in having TEC consider what may present a new technology, products or product modification. We would be h...
A.
for
B.
via
C.
though
D.
with
【简答题】若首项为a 1 ，公比为q的等比数列的前n项和总小于这个数列的各项和，则首项a 1 ，公比q的一组取值可以是（a 1 ，q）=（ ）。
【简答题】已知等比数列 的首项为 ，公比为 q ，且有 ，求 的取值范围．
【单选题】— Would you like to spend the vacation in Paris with me? — I' d like to you pay for me.
A.
unless
B.
because
C.
Provided
D.
as
【简答题】设数列8，a 2 ，a 3 ，a 4 是等比数列，其公比q不是整数，且q＞1，则这个数列中a 4 可取到的最小值为______．
【单选题】已知函数f（x）= 3 cosx+sinx+4的值域为M，在M中取三个不相等的数y 1 、y 2 、y 3 ，使之构成公比为q的等比数列，则公比q的取值范围为 （ ）
A.
(0，1)∪(1， 3 ]
B.
(1， 3 ]
C.
[ 3 3 ， 3 ]
D.
[ 3 3 ，1)∪(1， 3 ]
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