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【单选题】
硅油风扇离合器当气流温度超过( )时,从动板上的进油口打开,阀片关闭进油口,硅油不能再进入工作室。
A.
25℃
B.
30℃
C.
35℃
D.
65℃
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【简答题】小红和小丽对问题“若方程组 a 1 x+ b 1 y= c 1 a 2 x+ b 2 y= c 2 的解是 x=3 y=-4 ,求方程组 3 a 1 x+2 b 1 y=5 c 1 3 a 2 x+2 b x y=5 c 2 的解”提出各自的想法.小红说:“这个题目好象条件不够,不能求解”;小丽说:“能不能把第二个方程组的两个方程的两边都除以5,通过整体代换的方法来解决”.参考他们的讨论,你认为这...
【单选题】下列五个命题: (1)若直角三角形的两条边长为5和12,则第三边长是13; (2)如果a≥0,那么 ( a ) 2 =a (3)若点P(a,b)在第三象限,则点P(-a,-b+1)在第一象限; (4)对角线互相垂直且相等的四边形是正方形; (5)两边及第三边上的中线对应相等的两个三角形全等. 其中不正确命题的个数是(  )
A.
2个
B.
3个
C.
4个
D.
5个
【单选题】根据下列文章,请回答 16~20 题。 I have a friend who is a team leader of about 25 employees who are primarily women. She' s found a trick that works for her most of the time, but not always. Those staff who appear...
A.
We shall not be moved.
B.
Money means freedom.
C.
Photos taking are pleasant.
D.
There are people who are so careless about dressing.
E.
Action speaks louder than words.
F.
It is our society that must be blamed.
G.
You should wear appropriately where you are.
【单选题】进行英语写作课的时候,教师可以随时把某一范文或是某一学生的作文转播到所有学生的终端,进行讲评,让学生有直观、具体的认识,这中形式能够______。
A.
为教师的演示教学提供新的方式
B.
扩大和紧密英语学习的共同体
C.
促进学生主动构建的英语学习
D.
创设英语学习环境
【简答题】I have a friend who had financial problems and needed my help occasionally. He was in his final year in University while I was in my third year. He needed some money for school fees and other academic...
【单选题】下述程序的输出结果是( )。 #include <stdio.h> int f(n) int n { if(n==0 | | n==1) return 3 return n-f(n-2) } void main() {printf('/n%d',f(10)) }
A.
3
B.
8
C.
9
D.
10
【简答题】已知等差数列{a n }为递增数列,满足 a 3 2 =5 a 1 +5 a 5 -25 ,在等比数列{b n }中,b 3 =a 2 +2,b 4 =a 3 +5,b 5 =a 4 +13. (Ⅰ)求数列{b n }的通项公式b n ; (Ⅱ)若数列{b n }的前n项和为S n ,求证:数列{ S n + 5 4 }是等比数列.
【简答题】若3,4,a和5,b,13是两组勾股数,则a+b的值是___________.
【单选题】以下程序运行的结果为( ) int &put(int n); int vals[10]; int error=-1; int main() { put(0)=12; put(9)=21; cout=0 && n<=9 ) { return vals[n]; } else { cout< return error; } }
A.
0000
B.
1221
C.
1209
D.
2109
【单选题】I have a friend who the piano very well.
A.
play
B.
playing
C.
plays
D.
played
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