M5卷烟机MAX压缩空气进口压力在()bar左右。A.3 B.4 C.6 D.8

题型:单项选择题

问题:

M5卷烟机MAX压缩空气进口压力在()bar左右。

A.3

B.4

C.6

D.8

考点:卷烟卷接工卷烟卷接工题库
题型:单项选择题
已知椭圆Γ:
x2
a2
+
y2
b2
=1(a>b>0)
的离心率为
2
2
,且椭圆Γ的右焦点F与抛物线y2=4x的焦点重合.
(Ⅰ)求椭圆Γ的标准方程;
(Ⅱ)过左焦点F的直线l与椭圆交于A,B两点,是否存在直线l,使得OA⊥OB,O为坐标原点,若存在,求出l的方程,若不存在,说明理由.
题型:单项选择题

下列因素中,属于划分社会阶层主要依据的有()。

A.年龄

B.职业

C.收入

D.受教育程度

E.风俗习惯

题型:单项选择题

Kofi Annan says helping survivors of last week’’s earthquake and (1)________in the Indian Ocean is (2)________. The United Nations secretary-general says countries that have offered aid must (3)________and provide it. The offers add up to around (4)________dollars. United Nations officials say (5) ________of that is needed during the next six months.The concern about offers of international aid is (6)________. For example, the earthquake in Bam, Iran, in (7)________of 2003 killed more than (8) ________people. Countries and groups offered hundreds of millions of dollars (9) ________. The United Nations says it has (10)________only about (11)________dollars in aid received so far. Governments and organizations that offered help (12) ________that, however.On (13)________Mr. Annan met with world leaders in Jakarta, Indonesia to discuss aid for (14)________. The leaders discussed and (15)________the idea of (16)________owed by affected nations. But the leaders did not say they would do so. Some said that (17)________to survivors would be more helpful.Representatives of (18)________countries and international organizations attended the meeting in Jakarta. Officials say they will cooperate to develop (19)________ for the Indian Ocean and the (20)________.

题型:单项选择题

纤维素和半纤维素大量存在于()

A.麸皮

B.水果

C.蔬菜

D.畜肉

E.虾皮

题型:单项选择题

根据方差的分解定理(加法定理)有:一个分组数列的总方差,等于其各组()的平均数与其组间方差的和。

更多题库